6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 under

the Securities Exchange Act of 1934

For

the month ended April, 2017

ICON plc

(Registrant's name)

333-08704

(Commission file number)

South County Business Park, Leopardstown, Dublin 18, Ireland

(Address of principal executive offices)

Brendan Brennan, CFO

South County Business Park, Leopardstown, Dublin 18, Ireland.

Brendan.Brennan@iconplc.com

011-353-1-291-2000

 (Name, telephone number, email and/or facsimile number and address of Company contact person)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.
	Yes___X___	No_______
Indicate by check mark whether the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):
	Yes______	No___X___
Indicate by check mark whether the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):
	Yes______	No___X___
Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule12g3-2(b) under the Securities Exchange Act of 1934.
	Yes______	No___X___
If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):82 N/A

ICON plc

Rider A

This report on Form 6-K is hereby incorporated by reference in the registration statement on Form F-3 (Registration No. 333-133371) of ICON plc and in the prospectus contained therein, and this report on Form 6-K shall be deemed a part of such registration statement from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished by ICON plc under the Securities Act of 1933 or the Securities Exchange Act of 1934.

1

GENERAL

As used herein, “ICON”, the “Company” and “we” refer to ICON plc and its consolidated subsidiaries, unless the context requires otherwise.

Business

ICON public limited company (“ICON”) is a contract research organization (“CRO”), providing outsourced development services on a global basis to the pharmaceutical, biotechnology and medical device industries. We specialize in the strategic development, management and analysis of programs that support all stages of the clinical development process - from compound selection to Phase I-IV clinical studies.  Our vision is to be the global CRO partner of choice, delivering best in class information, solutions and performance in clinical and outcomes research.

We believe that we are one of a select group of CROs with the expertise and capability to conduct clinical trials in most major therapeutic areas on a global basis and have the operational flexibility to provide development services on a stand-alone basis or as part of an integrated “full service” solution. At March 31, 2017 we had approximately 12,328 employees, in 87 locations in 38 countries. During the three months ended March 31, 2017 we derived approximately 46.7%, 41.8% and 11.5% of our net revenue in the United States, Europe and Rest of World respectively.

We began operations in 1990 and have expanded our business predominately through organic growth, together with a number of strategic acquisitions to enhance our capabilities and expertise in certain areas of the clinical development process.  We are incorporated in Ireland and our principal executive office is located at: South County Business Park, Leopardstown, Dublin 18, Republic of Ireland. The contact telephone number of this office is 353 (1) 291 2000.

Recent Developments

Changes in Board composition and executive leadership transition

On March 1, 2017, Mr. Ciaran Murray transitioned from his role as Chief Executive Officer to the role of Executive Chairman of the Board of Directors. On this date, Dr. Steve Cutler was appointed as Chief Executive Officer. As a part of this transition, Mr. Declan McKeon stepped down as Chairman of the Board of Directors and was appointed to the position of lead independent director.

Acquisitions

On September 15, 2016, a subsidiary of the Company, ICON US Holdings Inc. acquired Clinical Research Management, Inc. (“ClinicalRM”) which resulted in initial net cash outflows of $52.4 million (including certain payments made on behalf of ClinicalRM totaling $9.2 million).  ClinicalRM is a full-service CRO specializing in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. The organization helps customers progress their products to market faster, with a wide array of research, regulatory and sponsor services within the U.S. and around the globe. ClinicalRM provide full service and functional research solutions to a broad range of US government agencies and commercial customers. Their extensive expertise extends across basic and applied research, infectious diseases, vaccines development and testing and the response to bio-threats. They have worked in collaboration with government and commercial customers to respond to the threat of global viral epidemics.

Share repurchase program

A resolution was passed at the Company’s Annual General Meeting (“AGM”) on July 22, 2016 which authorizes the Directors to purchase (buyback) up to 10% of the outstanding shares in the Company.  On October 3, 2016, the Company commenced the share buyback program of up to $400 million.  At December 31, 2016 a total of 1,429,187 ordinary shares were redeemed by the Company under the buyback program for a total consideration of $110.0 million.  At March 31, 2017 a total of 2,650,916 ordinary shares were redeemed by the Company under this buyback program for a total consideration of $206.4 million.   All ordinary shares that were redeemed under the buyback program were canceled in accordance with the Constitution of the Company and the nominal value of these shares transferred to other undenominated capital as required by Irish Company law.

2

New accounting pronouncements

Accounting Standards Update (‘ASU’) 2016-09 ‘Improvements to Employee Share-Based Payment Accounting’ was issued in March 2016 which simplifies various aspects related to the accounting and presentation of share-based payments. The amendments require entities to record all tax effects related to share-based payments at settlement or expiration through the income statement and the windfall tax benefit to be recorded when it arises, subject to normal valuation allowance considerations. All tax-related cash flows resulting from share-based payments are required to be reported as operating activities in the statement of cash flows.  The effective date of the new standard for public companies is for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The Company has applied the modified retrospective approach, as required by the amendment to the standard, in determining the cumulative increase in retained earnings at January 1, 2017.  This resulted in the recognition of previously unrecognized excess tax benefits, as a credit to retained earnings, of $6.7 million.  The Company has adopted the cash flow presentation prospectively.

3

ICON plc

CONDENSED CONSOLIDATED BALANCE SHEETS

AS AT MARCH 31, 2017 AND DECEMBER 31, 2016

	(Unaudited)			(Audited)
	March 31,			December 31,
	2017			2016
ASSETS	(in thousands)
Current Assets:
Cash and cash equivalents	$	237,299		$	192,541
Short term investments - available for sale		81,667			68,046
Accounts receivable, net		340,540			416,229
Unbilled revenue		226,152			192,687
Other receivables		35,800			32,044
Prepayments and other current assets		37,760			35,170
Income taxes receivable		22,988			21,241
Total current assets		982,206			957,958
Other Assets:
Property, plant and equipment, net		148,644			148,967
Goodwill		617,813			616,088
Non-current other assets		14,400			13,831
Non-current income taxes receivable		9,975			12,698
Non-current deferred tax asset		29,929			19,691
Intangible assets		52,248			56,610
Total Assets	$	1,855,215		$	1,825,843
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current Liabilities:
Accounts payable	$	13,591		$	8,696
Payments on account		266,704			272,757
Other liabilities		213,611			190,727
Income taxes payable		21,638			22,226
Total current liabilities		515,544			494,406
Other Liabilities:
Non-current bank credit lines and loan facilities		348,604			348,511
Non-current other liabilities		24,821			23,752
Non-current government grants		890			887
Non-current income taxes payable		16,457			8,482
Non-current deferred tax liability		4,390			4,631
Commitments and contingencies		-			-
Total Liabilities		910,706			880,669
Shareholders' Equity:
Ordinary shares, par value 6 euro cents per share; 100,000,000 shares authorized,
53,775,703 shares issued and outstanding at March 31, 2017 and
54,530,843 shares issued and outstanding at December 31, 2016		4,644			4,692
Additional paid‑in capital		449,678			438,126
Other undenominated capital		887			809
Accumulated other comprehensive income		(80,152	)		(86,300	)
Retained earnings		569,452			587,847
Total Shareholders' Equity		944,509			945,174
Total Liabilities and Shareholders' Equity	$	1,855,215		$	1,825,843

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

ICON plc

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

FOR THE THREE MONTHS ENDED MARCH 31, 2017 AND MARCH 31, 2016

 (UNAUDITED)

	Three Months Ended
	March 31,			March 31,
	2017			2016
	(in thousands except share and per share data)
Revenue:
Gross revenue	$	578,066		$	542,583
Reimbursable expenses		(146,112	)		(142,061	)
Net revenue		431,954			400,522
Costs and expenses:
Direct costs		250,459			228,603
Selling, general and administrative expense		81,389			80,789
Depreciation and amortization		14,448			15,120
Total costs and expenses		346,296			324,512
Income from operations		85,658			76,010
Interest income		555			334
Interest expense		(3,179	)		(3,215	)
Income before provision for income taxes		83,034			73,129
Provision for income taxes		(11,625	)		(10,165	)
Net income	$	71,409		$	62,964
Net income per Ordinary Share:
Basic	$	1.31		$	1.14
Diluted	$	1.29		$	1.12
Weighted average number of Ordinary Shares outstanding:
Basic		54,372,931			55,011,019
Diluted		55,371,826			56,242,164

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

ICON plc

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

FOR THE THREE MONTHS ENDED MARCH 31, 2017 AND MARCH 31, 2016 (UNAUDITED)

	Three Months Ended
	March 31,			March 31,
	2017			2016
Cash flows from operating activities:	(in thousands)
Net income	$	71,409		$	62,964
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of property, plant and equipment		-			7
Depreciation expense		10,018			10,161
Amortization of intangibles		4,430			4,959
Amortization of government grants		(10	)		(11	)
Interest on short term investments		(251	)		(210	)
Stock compensation expense		8,809			9,591
Amortization of gain on interest rate hedge		(230	)		(210	)
Amortization of financing costs		140			130
Deferred taxes		(3,593	)		(4,859	)
Changes in assets and liabilities:
Decrease in accounts receivable		76,478			47,407
Increase in unbilled revenue		(32,944	)		(64,516	)
Increase in other receivables		(3,103	)		(3,730	)
(Increase)/decrease in prepayments and other current assets		(2,522	)		1,586
Increase in other non-current assets		(526	)		(1,413	)
Decrease in payments on account		(6,115	)		(687	)
Increase/(decrease) in other current liabilities		22,568			(10,612	)
Increase in other non-current liabilities		1,082			1,520
Increase in income taxes payable		8,839			8,626
Increase/(decrease) in accounts payable		4,848			(1,383	)
Net cash provided by operating activities		159,327			59,320
Cash flows from investing activities:
Purchase of property, plant and equipment		(8,298	)		(7,658	)
Purchase of short term investments		(17,977	)		(98	)
Sale of short term investments		4,675			158
Net cash used in investing activities		(21,600	)		(7,598	)
Cash flows from financing activities:
Proceeds from exercise of equity compensation		2,780			1,137
Share issue costs		(7	)		-
Excess tax benefit on exercise of equity compensation		-			4,241
Repurchase of ordinary shares		(96,404	)		-
Share repurchase costs		(77	)		-
Net cash provided by financing activities		(93,708	)		5,378
Effect of exchange rate movements on cash		739			326
Net increase in cash and cash equivalents		44,758			57,426
Cash and cash equivalents at beginning of period		192,541			103,911
Cash and cash equivalents at end of period	$	237,299		$	161,337

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

ICON plc

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME

(UNAUDITED)

	Shares			Amount			Additional Paid-in Capital			Other Undenominated Capital		Accumulated Other Comprehensive Income			Retained Earnings			Total
	(dollars in thousands, except share data)
Balance at December 31, 2016		54,530,843		$	4,692		$	438,126		$	809	$	(86,300	)	$	587,847		$	945,174
Comprehensive income:
Net income		-			-			-			-		-			71,409			71,409
Currency translation adjustment		-			-			-			-		4,275			-			4,275
Currency impact of long term funding		-			-			-			-		1,962			-			1,962
Tax on currency impact of long term funding		-			-			-			-		73			-			73
Unrealized capital gain – investments		-			-			-			-		68			-			68
Amortization of interest rate hedge		-			-			-			-		(230	)		-			(230	)
Total comprehensive income		-			-			-			-		6,148			71,409			77,557
Exercise of share options		121,210			8			2,750			-		-			-			2,758
Issue of restricted share units		345,379			22			-			-		-			-			22
Share issuance costs		-			-			(7	)		-		-			-			(7	)
Non-cash stock compensation expense		-			-			8,809			-		-			-			8,809
Share repurchase program		(1,221,729	)		(78	)		-			78		-			(96,404	)		(96,404	)
Share repurchase costs		-			-			-			-		-			(77	)		(77	)
Cumulative effect adjustment from adoption of ASU 2016-09		-			-			-			-		-			6,677			6,677
Balance at March 31, 2017		53,775,703		$	4,644		$	449,678		$	887	$	(80,152	)	$	569,452		$	944,509

The accompanying notes are an integral part of these condensed consolidated financial statements.

7

ICON plc

NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

March 31, 2017

1. Basis of Presentation

These condensed consolidated financial statements which have been prepared in accordance with United States Generally Accepted Accounting Principles (“US GAAP”) have not been audited. The condensed consolidated financial statements reflect all adjustments, which are, in the opinion of management, necessary to present a fair statement of the operating results and financial position for the periods presented. The preparation of the condensed consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures in the condensed consolidated financial statements.  Actual results could differ from those estimates.

The condensed consolidated financial statements should be read in conjunction with the accounting policies and notes to the consolidated financial statements included in ICON’s Form 20-F for the year ended December 31, 2016. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the fiscal period ending December 31, 2017.

2. Goodwill

	Three months ended		Year ended
	March 31,		December 31,
	2017		2016
	(in thousands)
Opening balance	$	616,088	$	588,434
Current period acquisitions (Note 3)		-		34,576
Prior period acquisitions (Note 3)		-		7,689
Foreign exchange movement		1,725		(14,611	)
Closing balance	$	617,813	$	616,088

8

3. Business Combinations

Acquisitions – Clinical Research Management, Inc.

On September 15, 2016, a subsidiary of the Company, ICON US Holdings Inc. acquired ClinicalRM resulting in an initial net cash outflow of $52.4 million inclusive of certain payments made on behalf of ClinicalRM totaling $9.2 million.

ClinicalRM is a full-service CRO specializing in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. The organization helps customers progress their products to market faster with a wide array of research, regulatory and sponsor services within the U.S. and around the globe. ClinicalRM provide full service and functional research solutions to a broad range of US government agencies. Their extensive expertise extends across basic and applied research, infectious diseases, vaccines development and testing and the response to bio-threats.  They have worked in collaboration with government and commercial customers to respond to the threat of global viral epidemics.  Further consideration of up to $12.0 million is payable if certain performance milestones are achieved in respect of periods up to December 31, 2017.  The fair value of the deferred consideration on acquisition and at March 31, 2017 has been estimated at $6 million.

The acquisition of ClinicalRM has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations. The Company has made a provisional assessment of the fair value of assets acquired and liabilities assumed as at that date. The table following summarizes the Company’s provisional estimates of the fair values of the assets acquired and liabilities assumed:

	September 15,
	2016
	(in thousands)
Cash	$	3,168
Property, plant and equipment		939
Goodwill*		34,576
Intangible assets**		8,644
Accounts receivable		11,725
Unbilled revenue		2,814
Prepayments and other current assets		1,673
Accounts payable		(621	)
Other liabilities		(4,515	)
Non-current other liabilities		(7	)
Net assets acquired	$	58,396
Cash outflows (including other liabilities assumed of $9.2 million)	$	52,396
Contingent consideration		6,000
Total cash outflows	$	58,396

*Goodwill represents the acquisition of an established workforce with experience in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. Goodwill related to the US portion of the business acquired is tax deductible.

**The Company has made an initial estimate of separate intangible assets acquired of $8.6 million, being customer relationships and order book assets.  This assessment is under review and will be finalized within 12 months of the date of acquisition.

9

Acquisitions - PMG

On December 4, 2015, a subsidiary of the Company, ICON Clinical Research LLC. acquired PMG for total cash outflows of $65.4 million, including certain payments made on behalf of PMG totaling $10.1 million.  PMG is an integrated network of 52 clinical research sites in North Carolina, South Carolina, Tennessee, Illinois and Iowa.  The site network includes wholly owned facilities and dedicated clinical research sites. PMG conducts clinical trials in all major therapeutic areas and has particular expertise in vaccine, gastroenterology, cardiovascular, neurology and endocrinology studies.  It has a proprietary database of clinical trial participants.  It also has access to in excess of 2 million active patients via electronic medical records through its partnerships with healthcare institutions and community physical practices.

The acquisition of PMG has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations.  The table following summarizes the fair values of the assets acquired and liabilities assumed:

	December 4,
	2015
	(in thousands)
Cash	$	194
Property, plant and equipment		712
Goodwill*		48,728
Customer lists		6,938
Order backlog		2,948
Accounts receivable		11,597
Prepayments and other current assets		1,329
Accounts payable		(530	)
Other liabilities		(3,456	)
Non-current deferred tax liability		(3,106	)
Net assets acquired	$	65,354
Cash consideration	$	53,681
Other liabilities assumed		10,060
Working capital adjustment		1,613
Total cash outflows	$	65,354

*Goodwill represents the acquisition of an established workforce with experience in clinical trial consulting and regulatory support for the development of drugs, medical devices and diagnostics, with a specific focus on strategy to increase efficiency and productivity in product development.   In finalizing the goodwill on acquisition of PMG in the twelve month period from acquisition, fair value adjustments were made to deferred tax liabilities ($3.1 million), accounts receivable acquired ($1.4 million), other liabilities ($1.2 million) and the value of the customer list and order backlog assets acquired ($0.4 million).  Additional consideration of $1.6 million was provided on completion of the contractual working capital process.

10

Acquisitions - MediMedia Pharma Solutions

On February 27, 2015, a subsidary of the Company, ICON Holdings Unlimited Company (formerly ICON Holdings), acquired MediMedia Pharma Solutions for cash consideration of $104.8 million (net of working capital adjustments of $3.9 million).  In addition to the cash consideration, certain payments were made on behalf of MediMedia Pharma Solutions on completion totaling $11.3 million. Headquartered in Yardley, Pennsylvania, MediMedia Pharma Solutions includes MediMedia Managed Markets and Complete Healthcare Communications.  MediMedia Managed Markets is a leading provider of strategic payer-validated market access solutions.  Complete Healthcare Communications is one of the leading medical and scientific communication agencies working with medical affairs, commercial and brand development teams within life science companies. The acquisition agreement also provided for certain working capital targets to be achieved by MediMedia Pharma Solutions.

The acquisition of MediMedia Pharma Solutions has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations. The table following summarizes the fair values of the assets acquired and liabilities assumed on acquisition:

	February 27,
	2015
	(in thousands)
Property, plant and equipment	$	1,049
Goodwill*		92,084
Customer lists		22,752
Order backlog		2,521
Accounts receivable		5,240
Unbilled revenue		4,324
Prepayments and other current assets		621
Accounts payable		(749	)
Payments on account		(4,186	)
Deferred tax liability		(2,171	)
Other liabilities		(5,483	)
Net assets acquired	$	116,002
Cash consideration	$	108,717
Other liabilities assumed**		11,283
Gross cash outflows		120,000
Working capital adjustment		(3,998	)
Net cash outflows	$	116,002

* Goodwill represents the acquisition of an established workforce with experience in the provision of strategic payer-validated market access solutions while the acquisition of Complete Healthcare Communications comprises an established workforce with significant communication experience working with medical affairs, commercial and brand development teams within the life science industry. Goodwill related to the US portion of the business is tax deductible.

** Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

11

4. Restructuring

Prior Periods Restructuring Charges

A restructuring charge of $8.2 million was recognized during the year ended December 31, 2016 under a restructuring plan adopted following a review by the Company of its operations.  The restructuring plan includes resource rationalizations in certain areas of the business to improve resource utilization, resulting in a charge of $6.2 million and office consolidation resulting in the recognition of an onerous lease obligation of $2.0 million during the twelve months ended December 31, 2016.  No additional charge was recorded during the three months ended March 31, 2017.

	Workforce				Onerous
	Reductions				Lease				Total
	(in thousands)
Total provision recognized		$	6,190			$	1,969			$	8,159
Utilized			(5,734	)			(571	)			(6,305	)
Foreign exchange			(63	)			-				(63	)
Provision at December 31, 2016		$	393			$	1,398			$	1,791
Utilized			(393	)			(375	)			(768	)
Provision at March 31, 2017			-			$	1,023			$	1,023

A restructuring charge of $8.8 million was recognized during the year ended December 31, 2014. Following the closure of the Company’s European Phase 1 services in 2013, the Company recognized a charge in 2014 in relation to its Manchester, United Kingdom facility; $5.6 million in relation to asset impairments and $3.2 million in relation to an onerous lease charge associated with this facility. We expect this to be paid by 2024.

	Asset			Onerous
	Impairment			Lease			Total
	(in thousands)
Total provision recognized	$	5,629		$	3,167		$	8,796
Asset write-off		(5,629	)		-			(5,629	)
Provision at December 31, 2014		-		$	3,167		$	3,167
Utilized		-			(1,167	)		(1,167	)
Provision at December 31, 2015		-			2,000			2,000
Utilized		-			(1,359	)		(1,359	)
Provision at December 31, 2016		-			641			641
Utilized		-			(149	)		(149	)
Provision at March 31, 2017		-			492			492

At March 31, 2017, $1.0 million is included within other liabilities and $0.5 million within non-current other liabilities.

12

5. Income Taxes

Income taxes recognized during the three months ended March 31, 2017 comprise:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Provision for income taxes	$	11,625	$	10,165

As at March 31, 2017 the Company maintains a $30.6 million liability (December 31, 2016: $29.9 million) for unrecognized tax benefit, which is comprised of $27.2 million (December 31, 2016: $26.6 million) related to items generating unrecognized tax benefits and $3.4 million (December 31, 2016: $3.3 million) for interest and related penalties to such items.  The Company recognizes interest accrued on unrecognized tax benefits as an additional income tax expense.

The Company has analyzed the filing positions in all of the significant federal, state and foreign jurisdictions where it is required to file income tax returns, as well as open tax years in these jurisdictions.  The only periods subject to examination by the major tax jurisdictions where the Company does business are 2012 through 2016 tax years.  The Company does not believe that the outcome of any examination will have a material impact on its financial statements.

6. Net income per ordinary share

Basic net income per ordinary share has been computed by dividing net income available to ordinary shareholders by the weighted average number of ordinary shares outstanding during the period.  Diluted net income per ordinary share is computed by adjusting the weighted average number of ordinary shares outstanding during the period for all potentially dilutive ordinary shares outstanding during the period and adjusting net income for any changes in income or loss that would result from the conversion of such potential ordinary shares.  There is no difference in net income used for basic and diluted net income per ordinary share.

The reconciliation of the number of shares used in the computation of basic and diluted net income per ordinary share is as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
Weighted average number of ordinary shares outstanding for basic net income per ordinary share		54,372,931		55,011,019
Effect of dilutive share options outstanding		998,895		1,231,145
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share		55,371,826		56,242,164

7. Share-based Awards

Share Options

On July 21, 2008 the Company adopted the Employee Share Option Plan 2008 (the “2008 Employee Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may grant options to any employee, or any Director holding a salaried office or employment with the Company or a Subsidiary for the purchase of ordinary shares.  On the same date, the Company also adopted the Consultants Share Option Plan 2008 (the “2008 Consultants Plan”), pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may grant options to any consultant, adviser or non-executive Director retained by the Company or any Subsidiary for the purchase of ordinary shares.

13

On February 14, 2017 both the 2008 Employee Plan and the 2008 Consultants Plan (together the “2008 Option Plans”) were amended and restated in order to increase the number of options that can be issued under the 2008 Consultants Plan from 400,000 to 1 million and to extend the date for options to be granted under the 2008 Option Plans.

Each option granted under the 2008 Option Plans will be an employee stock option, or Non-qualifying Stock Options (‘NSO’), as described in Section 422 or 423 of the Internal Revenue Code.  Each grant of an option under the 2008 Options Plans will be evidenced by a Stock Option Agreement between the optionee and the Company.  The exercise price will be specified in each Stock Option Agreement, however option prices will not be less than 100% of the fair market value of an ordinary share on the date the option is granted.

An aggregate of 6 million ordinary shares have been reserved under the 2008 Employee Plan, as reduced by any shares issued or to be issued pursuant to options granted under the 2008 Consultants Plan, under which a limit of 1 million shares applies.  Further, the maximum number of ordinary shares with respect to which options may be granted under the 2008 Employee Option Plan, during any calendar year to any employee shall be 400,000 ordinary shares.  There is no individual limit under the 2008 Consultants Plan.  No options may be granted under the 2008 Option Plans after February 14, 2027.

On January 17, 2003 the Company adopted the Share Option Plan 2003 (the “2003 Share Option Plan”) pursuant to which the Compensation and Organization Committee of the Board could grant options to officers and other employees of the Company or its subsidiaries for the purchase of ordinary shares.  An aggregate of 6 million ordinary shares were reserved under the 2003 Share Option Plan; and, in no event could the number of ordinary shares issued pursuant to options awarded under this plan exceed 10% of the outstanding shares, as defined in the 2003 Share Option Plan, at the time of the grant, unless the Board expressly determined otherwise.  Further, the maximum number of ordinary shares with respect to which options could be granted under the 2003 Share Option Plan during any calendar year to any employee was 400,000 ordinary shares.  The 2003 Share Option Plan expired on January 17, 2013.  No new options may be granted under this plan.

Share option awards are granted with an exercise price equal to the market price of the Company’s shares at date of grant. Share options typically vest over a period of five years from date of grant and expire eight years from date of grant. The maximum contractual term of options outstanding at March 31, 2017 is eight years.

The following table summarizes option activity for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value		Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		1,466,444		$	43.45	$	13.94
Granted		135,243		$	83.47	$	24.49
Exercised		(121,210	)	$	22.75	$	8.71
Forfeited		(10,347	)	$	41.44	$	13.42
Outstanding at March 31, 2017		1,470,130		$	48.86	$	15.35		4.96
Exercisable at March 31, 2017		682,269		$	36.53	$	12.35		3.79

The Company has outstanding options with fair values ranging from $6.72 to $24.49 per option or a weighted average fair value of $11.12 per option.  The Company issues ordinary shares for all options exercised.  The total amount of fully vested share options which remained outstanding at March 31, 2017, was 682,269.  Fully vested share options at March 31, 2017, have an average remaining contractual term of 3.79 years, an average exercise price of $36.53 and a total intrinsic value of $29.5 million.  The total intrinsic value of options exercised during the three months ended March 31, 2017 was $7.4 million (March 31, 2016: $2.2 million).

14

The following table summarizes the movement in non-vested share options for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value
Non-vested outstanding at December 31, 2016		814,870		$	54.37	$	16.55
Granted		135,243		$	83.47	$	24.49
Vested		(152,865	)	$	54.19	$	16.55
Forfeited		(9,387	)	$	43.40	$	13.86
Non-vested outstanding at March 31, 2017		787,861		$	59.53	$	17.94

Fair value of Stock Options Assumptions

The weighted average fair value of options granted during the three months ended March 31, 2017 and March 31, 2016 was calculated using the Black-Scholes option pricing model.  The weighted average fair values and assumptions used were as follows:

	Three Months Ended
	March 31,			March 31,
	2017			2016
Weighted average fair value	$	24.49		$	20.78
Assumptions:
Expected volatility		29	%		30	%
Dividend yield		0	%		0	%
Risk-free interest rate		2.05	%		1.39	%
Expected life	5 years			5 years

Expected volatility is based on the historical volatility of our common stock over a period equal to the expected term of the options; the expected life represents the weighted average period of time that options granted are expected to be outstanding given consideration to vesting schedules and our historical experience of past vesting and termination patterns. The risk-free rate is based on the U.S. government zero-coupon bonds yield curve in effect at time of the grant for periods corresponding with the expected life of the option.

Restricted Share Units and Performance Share Units

On July 21, 2008 the Company adopted the 2008 Employees Restricted Share Unit Plan (the “2008 RSU Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may select any employee, or any Director holding a salaried office or employment with the Company, or a Subsidiary to receive an award under the plan. An aggregate of 1.0 million ordinary shares have been reserved for issuance under the 2008 RSU Plan.

On April 23, 2013 the Company adopted the 2013 Employees Restricted Share Unit (“RSU”) and Performance Share Unit (“PSU”) Plan (the “2013 RSU Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may select any employee, or any Director holding a salaried office or employment with the Company, or a Subsidiary to receive an award under the plan.  On May 11, 2015 the 2013 RSU Plan was amended and restated in order to increase the number of shares that can be issued under the RSU Plan by 2.5 million shares.  Accordingly, an aggregate of 4.1 million ordinary shares have been reserved for issuance under the 2013 RSU Plan.  The shares are awarded at par value and vest over a service period.  Awards under the 2013 RSU Plan may be settled in cash or shares at the option of the Company.

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The Company has awarded RSUs and PSUs to certain key individuals of the Group.  The following table summarizes RSU and PSU activity for the three months ended March 31, 2017:

	PSU Outstanding Number of Shares			PSU Weighted Average Fair Value		PSU Weighted Average Remaining Contractual Life		RSU Outstanding Number of Shares			RSU Weighted Average Fair Value		RSU Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		830,523		$	60.73		1.11		1,025,484		$	58.64		1.40
Granted		79,346		$	83.47				39,146		$	83.47
Shares vested		(308,144	)	$	46.86				(37,235	)	$	61.80
Forfeited		(11,154	)	$	51.35				(37,522	)	$	55.53
Outstanding at March 31, 2017		590,571		$	70.39		1.59		989,873		$	59.62		1.23

The fair value of RSUs vested for the three months ended March 31, 2017 totaled $2.3 million (full year 2016: $10.8 million).

The fair value of PSUs vested for the three months ended March 31, 2017 totaled $14.4 million (the fair value of PSUs vested for the full year 2016 was $10.3 million).

The PSUs vest based on service and specified EPS targets over the period 2014 – 2017, 2015 – 2018, 2016 – 2019 and 2017 – 2020.  Since 2013, 307,351 PSUs (net of forfeitures) have been granted.  Up to an additional 283,220 PSUs may also be granted, based on the actual EPS from 2014 to 2020.

Non-cash stock compensation expense

Non-cash stock compensation expense for the three months ended March 31, 2017 has been allocated as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Direct costs	$	4,854	$	5,285
Selling, general and administrative		3,955		4,306
	$	8,809	$	9,591

Total non-cash stock compensation expense not yet recognized at March 31, 2017 amounted to $63.2 million.  The weighted average period over which this is expected to be recognized is 2.2 years.

The amendments required by Accounting Standards Update (‘ASU’) 2016-09 ‘Improvements to Employee Share-Based Payment Accounting’ require the Company to record all tax effects related to share-based payments through the income statement rather than additional paid in capital.  The Company has applied the updated standard prospectively in the first quarter of the year ended December 31, 2017.

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8. Share Capital

On October 3, 2016 the Company commenced a previously announced share buyback program of up to $400 million.  The Company can acquire up to 10% of its outstanding ordinary shares (by way of redemption), in accordance with Irish law, the United States securities laws, and the Company’s constitutional documents through open market share acquisitions.

The buyback program gives a broker authority to acquire the Company’s ordinary shares from time to time on the open market in accordance with agreed terms and limitations.  The acquisition of shares pursuant to the buyback program was effected by way of redemption and cancellation of the shares, in accordance with the Constitution of the Company.

During the three months ended March 31, 2017 1,221,729 ordinary shares were redeemed by the Company under this buyback program for a total consideration of $96.4 million.  At March 31, 2017 a total of 2,650,916 ordinary shares were redeemed by the Company under this buyback program for a total consideration of $206.4 million.  All ordinary shares that were redeemed under the buyback program were cancelled in accordance with the Constitution of the Company and the nominal value of these shares transferred to an other undenominated capital reserve as required under Irish Company Law.

9. Business Segment Information

The Company determines and presents operating segments based on the information that is internally provided to the chief operating decision maker, together the (‘CODM’) in accordance with FASB ASC 280-10 Disclosures about Segments of an Enterprises and Related Information.  The Chief Executive Officer, Chief Financial Officer and Chief Operating Officer, were together considered the Company’s CODM in the period up to and including March 1, 2017.  On March 1, 2017, Mr Ciaran Murray transitioned from his role as Chief Executive Officer to the role of Executive Chairman of the Board of Directors and Dr. Steve Cutler was appointed as Chief Executive Officer.  As of, March 1, 2017, the Company determined that the CODM is comprised of the Chief Executive Officer and the Chief Financial Officer.

The Company determines and presents operating segments based on the information that is provided to the CODM.  The Company has determined that we operate in one single business segment which is the provision of outsourced development services on a global basis to the pharmaceutical, biotechnology and medical devices industries.  There have been no changes to the basis of segmentation or the measurement basis for the segment results in the period.

The Company is a contract research organization (“CRO”), providing outsourced development services on a global basis to the pharmaceutical, biotechnology and medical device industries.  It specializes in the strategic development, management and analysis of programs that support all stages of the clinical development process - from compound selection to Phase I-IV clinical studies.  The Company has the expertise and capability to conduct clinical trials in most major therapeutic areas on a global basis and has the operational flexibility to provide development services on a stand-alone basis or as part of an integrated “full service” solution.  The Company has expanded predominately through internal growth together with a number of strategic acquisitions to enhance its expertise and capabilities in certain areas of the clinical development process.

The Company is generally awarded projects based upon responses to requests for proposals received from companies in the pharmaceutical, biotechnology and medical device industries or work orders executed under our strategic partnership arrangements.  Contracts with customers are generally entered into centrally, in most cases with ICON Clinical Research Limited (“ICON Ireland”), the Company’s principal operating subsidiary in Ireland.  Revenues, which consist primarily of fees earned under these contracts, are allocated to individual entities within the Group, based on where the work is performed in accordance with the Company’s global transfer pricing model.

ICON Ireland acts as the group entrepreneur under the Company’s global transfer pricing model given its role in the development and management of the group, it’s ownership of key intellectual property and customer relationships, its key role in the mitigation of risks faced by the group and its responsibility for maintaining the Company’s global network.  ICON Ireland enters into the majority of the Company’s customer contracts.

ICON Ireland remunerates other operating entities in the ICON Group on the basis of a guaranteed cost plus mark up for the services they perform in each of their local territories.  The cost plus mark up for each ICON entity is established to ensure that each of ICON Ireland and the ICON entities that are involved in the conduct of services for customers, earn an appropriate arms-length return having regard to the assets owned, risks borne, and functions performed by each entity from these intercompany transactions.  The cost plus mark-up policy is reviewed annually to ensure that it is market appropriate.

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The geographic split of revenue disclosed for each region outside Ireland is the cost plus revenue attributable to these entities.  The residual revenues of the Group, once each ICON entity has been paid its respective intercompany service fee, generally fall to be retained by ICON Ireland.  As such revenues and income from operations in Ireland are a function of this global transfer pricing model and comprise net revenues of the Group after deducting the cost plus revenues attributable to the activities performed outside Ireland.

The Company's areas of operation outside of Ireland include the United States, United Kingdom, Belgium, France, Germany, Italy, Spain, The Netherlands, Sweden, Turkey, Poland, Czech Republic, Latvia, Russia, Ukraine, Hungary, Israel, Romania, Switzerland, Canada, Mexico, Brazil, Colombia, Argentina, Chile, Peru, India, China, South Korea, Japan, Thailand, Taiwan, Singapore, The Philippines, Australia, New Zealand, and South Africa.

The geographical distribution of the Company’s segment measures as at March 31, 2017 and December 31, 2016 and for the three months ended March 31, 2017 and March 31, 2016 is as follows:

a) The distribution of net revenue by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	109,205	$	100,835
Rest of Europe		71,453		75,642
U.S.		201,615		184,090
Rest of World		49,681		39,955
Total	$	431,954	$	400,522

* All sales shown for Ireland are export sales.

b) The distribution of income from operations, by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	63,968	$	59,551
Rest of Europe		3,699		3,444
U.S.		10,499		10,784
Rest of World		7,492		2,231
Total	$	85,658	$	76,010

c) The distribution of property, plant and equipment, net, by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	105,836	$	105,684
Rest of Europe		5,949		6,231
U.S.		27,931		29,428
Rest of World		8,928		7,624
Total	$	148,644	$	148,967

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d) The distribution of depreciation and amortization by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	5,972	$	5,904
Rest of Europe		1,658		1,715
U.S.		5,948		6,649
Rest of World		870		852
Total	$	14,448	$	15,120

e) The distribution of total assets by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	803,421	$	766,120
Rest of Europe		356,355		337,062
U.S.		628,012		651,160
Rest of World		67,427		71,501
Total	$	1,855,215	$	1,825,843

19

ICON plc

Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis should be read in conjunction with the unaudited Condensed Consolidated Financial Statements and accompanying notes included elsewhere herein and the Consolidated Financial Statements and related notes thereto included in our  Form 20-F for the year ended December 31, 2016.  The Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States.

Overview

We are a CRO providing outsourced development services on a global basis to the pharmaceutical, biotechnology and medical device industries.  We specialize in the strategic development, management and analysis of programs that support all stages of the clinical development process - from compound selection to Phase I-IV clinical studies.  Our vision is to be the Global CRO partner of choice, delivering best in class information, solutions and performance in clinical and outcomes research.

We believe that we are one of a select group of CROs with the expertise and capability to conduct clinical trials in most major therapeutic areas on a global basis and have the operational flexibility to provide development services on a stand-alone basis or as part of an integrated “full service” solution.  At March 31, 2017, we employed approximately 12,328 employees, in 87 locations in 38 countries.  During the three months ended March 31, 2017 we derived approximately 46.7%, 41.8% and 11.5% of our net revenue in the United States, Europe and Rest of World respectively.

Revenue consists primarily of fees earned under contracts with third-party clients.  In most cases, a portion of the contract fee is paid at the time the study or trial is started, with the balance of the contract fee generally payable in installments over the study or trial duration, based on the delivery of certain performance targets or "milestones".  Revenue from contracts is recognized on a proportional performance method based on the relationship between time incurred and the total estimated duration of the trial or on a fee-for-service basis depending to the particular circumstances of the contract.  As is customary in the CRO industry, we contract with third party investigators in connection with clinical trials.  All investigator fees and certain other costs, where reimbursed by clients, are deducted from gross revenue to arrive at net revenue.  As these costs vary from contract to contract, we view net revenue as our primary measure of revenue growth.

As the nature of our business involves the management of projects having a typical duration of a few weeks to several years, the commencement or completion of projects in a fiscal year can have a material impact on revenues earned with the relevant clients in such years.  In addition, as we typically work with some, but not all, divisions of a client, fluctuations in the number and status of available projects within such divisions can also have a material impact on revenues earned from such clients from year to year.

Termination or delay in the performance of an individual contract may occur for various reasons, including, but not limited to, unexpected or undesired results, production problems resulting in shortages of the drug, adverse patient reactions to the drug, the client’s decision to de-emphasize a particular trial or inadequate patient enrolment or investigator recruitment.  In the event of termination the Company is usually entitled to all sums owed for work performed through the notice of termination and certain costs associated with the termination of the study.  In addition, contracts generally contain provisions for renegotiation in the event of changes in the scope, nature, duration, or volume of services of the contract.

Our backlog consists of potential net revenue yet to be earned from projects awarded by clients.  At March 31, 2017 we had a backlog of approximately $4.3 billion, compared with approximately $4.2 billion at December 31, 2016.  We believe that our backlog as of any date is not necessarily a meaningful predictor of future results, due to the potential for cancellation or delay of the projects underlying the backlog, and no assurances can be given on the extent to which we will be able to realize this backlog as net revenue.

Although we are domiciled in Ireland, we report our results in U.S. dollars.  As a consequence the results of our non-U.S. based operations, when translated into U.S. dollars, could be materially affected by fluctuations in exchange rates between the U.S. dollar and the currencies of those operations.

In addition to translation exposures, we are also subject to transaction exposures because the currency in which contracts are priced can be different from the currencies in which costs relating to those contracts are incurred.  Our operations in the United States are not materially exposed to such currency differences as the majority of our revenues and costs are in U.S. dollars.  However, outside of the United States the multinational nature of our activities means that contracts are usually priced in a single currency, most often U.S. dollars or euro, while costs arise in a number of currencies, depending, among other things, on which of our offices provide staff for the contract and the location of investigator sites.  Although many such contracts benefit from some degree of natural hedging, due to the matching of contract revenues and costs in the same currency, where costs are incurred in currencies other than those in which contracts are priced, fluctuations in the relative value of those currencies could have a material effect on our results of operations.

20

As we conduct operations on a global basis, our effective tax rate depends on the geographic distribution of our revenue and earnings among locations with varying tax rates. Our results therefore may be affected by changes in the tax rates of the various jurisdictions.  In particular, as the geographic mix of our results of operations among various tax jurisdictions changes, our effective tax rate may vary significantly from period to period.

Results of Operations

Three Months Ended March 31, 2017 compared with Three Months Ended March 31, 2016

The following table sets forth for the periods indicated certain financial data as a percentage of net revenue and the percentage change in these items compared to the prior comparable period.  The trends illustrated in the following table may not be indicative of future results.

	Three Months Ended
	March 31, 2017			March 31, 2016			2017 to 2016
							Percentage
	Percentage of Net Revenue						Increase/ (Decrease)
Net revenue		100.0	%		100.0	%		7.8	%
Costs and expenses:
Direct costs		58.0	%		57.1	%		9.6	%
Selling, general and administrative		18.9	%		20.2	%		0.7	%
Depreciation		2.3	%		2.5	%		(1.4	)%
Amortization		1.0	%		1.2	%		(10.7	)%
Income from operations		19.8	%		19.0	%		12.7	%

Net revenue for the period increased by $31.4 million, or 7.8%, from $400.5 millionfor the three months ended March 31, 2016 to $432.0 million for the three months ended March 31, 2017. Net revenue increased by 8.3% in constant currency and by 4.5% in constant dollar organic terms.  The increase in revenues in the three months ended March 31, 2017 can be explained by both continued organic growth, and the additional net revenues from the acquisition of ClinicalRM on September 15, 2016.  During the three months ended March 31, 2017 we derived approximately 46.7%, 41.8% and 11.5% of our net revenue in the United States, Europe and Rest of World respectively.  During the three months ended March 31, 2017 $194.9 million or 45% of our net revenues were derived from our top 5 customers compared to $179.2 million or 45% of net revenues derived from our top 5 customers during the three months ended March 31, 2016.  The largest of these customers related to a Strategic Partnership with a large global pharmaceutical company.  Net revenue from this customer contributed 24% of net revenue for the quarter, compared to 29% of net revenue in respect of the three months ended March 31, 2016.  The addition of new customer accounts, particularly mid-tier pharma customers and biotech customers continues to result in a reduction in concentration of revenues from our top five customers. 

21

Net revenue in Ireland increased from $100.8 million for the three months ended March 31, 2016 to $109.2 million for the three months ended March 31, 2017.  Net revenue in Ireland is principally a function of the Company’s global transfer pricing model (see note 7 Business Segmental Information for further details).Net revenue in our Rest of Europe region decreased from $75.6 million for the three months ended March 31, 2016 to $71.5 million for the three months ended March 31, 2017, while net revenue in our Rest of World region increased from $40.0 million for the three months ended March 31, 2016 to $49.7 million for the three months ended March 31, 2017.  Net revenue in the U.S. region increased from $184.1 million for the three months ended March 31, 2016 to $201.6 million for the three months ended March 31, 2017.  Net revenues in the U.S. region for the three months ended March 31, 2017 was impacted positively by the acquisition of ClinicalRM which was acquired on September 15, 2016.

Direct costs for the period increased by $21.9 million, or 9.6%, from $228.6 million for the three months ended March 31, 2016 to $250.5 million for the three months ended March 31, 2017. Direct costs consist primarily of compensation, associated fringe benefits and share based compensation expense for project-related employees and other direct project driven costs. The increase in direct costs during the period arose from an increase in headcount and a corresponding increase in personnel related expenditure of $17.1 million, and increases in other direct project related costs of $4.8 million and laboratory costs of $1.3 million.  This increase was offset by a decrease in travel related costs of $1.3 million.  As a percentage of net revenue, direct costs have increased from 57.1% for the three months ended March 31, 2016 to 58.0% for the three months ended March 31, 2017.

Selling, general and administrative expenses for the period increased by $0.6 million, or 0.7%, from $80.8 million for the three months ended March 31, 2016 to $81.4 million for the three months ended March 31, 2017.  Selling, general and administrative expenses comprise primarily of compensation, related fringe benefits and share based compensation expense for non-project-related employees, recruitment expenditure, professional service costs, advertising costs and all costs related to facilities and information systems.  The increase in selling, general and administration expenses for the period reflects continued focus on personnel related expenditure and facilities and related costs.  As a percentage of net revenue, selling, general and administrative expenses, decreased from 20.2% for the three months ended March 31, 2016 to 18.9% for the three months ended March 31, 2017.

Depreciation expense for the period decreased by $0.1 million, or 1.4%, from $10.2 million for three months ended March 31, 2016 to $10.0 million for three months ended March 31, 2017. Depreciation expense arises principally from continued investment in facilities, information systems and equipment to support the Company’s growth.  As a percentage of net revenue the depreciation expense for the three months ended March 31, 2017 (2.3%) decreased marginally on the percentage of net revenue charge for the three months ended March 31, 2016 (2.5%).  Amortization expense for the period decreased by $0.6 million, or 10.7%, from $5.0 million for the three months ended March 31, 2016 to $4.4 million for the three months ended March 31, 2017.  Amortization expense represents the amortization of intangible assets acquired on business combinations.  The main reason for the decrease in the amortization expense for the period relates to the cessation of the amortization charge in respect of the MediMedia order backlog asset in line with the amortization period of 2 years, this was offset in part by the additional amortization for the period related to the acquisition of CRM.  As a percentage of net revenue, amortization expense decreased from 1.2% for the three months ended March 31, 2016 to 1.0% for the three months ended March 31, 2017.

As a result of the above, income from operations for the three months increased by $9.6 million, or 12.7%, from $76.0 million for the three months ended March 31, 2016to $85.6 million for the three months ended March 31, 2017.  As a percentage of net revenue, income from operations increased from 19.0% of net revenues for the three months ended March 31, 2016to 19.8% of net revenues for the three months ended March 31, 2017.

Income from operations in Ireland increased from a profit of $59.6 million for the three months ended March 31, 2016 to a profit of $64.0 million for the three months ended March 31, 2017.  Income from operations in Ireland is impacted by the Group’s global transfer pricing model (see note 9 Business Segmental Information for further details). Income from operations in our Rest of Europe region increased from $3.4 million for the three months ended March 31, 2016 to $3.7 million for the three months ended March 31, 2017, while income from operations in our Rest of World region increased from $2.2 million for the three months ended March 31, 2016 to $7.5 million for the three months ended March 31, 2017.  This reflects a non-recurring intercompany pricing adjustment for services historically provided by certain Rest of World subsidiaries. Income from operations in the U.S. region decreased from $10.8 million for the three months ended March 31, 2016 to $10.5 million for the three months ended March 31, 2017, reflecting the contribution arising on the acquisition of CRM, offset in part by increased amortization charges and a poor performance in certain U.S. subsidiaries that do not operate under the Group's global transfer pricing model. 

22

Interest expense of $3.2 million for the three months ended March 31, 2017 is in line with the charge for the three months ended March 31, 2016.  Interest income increased by $0.3 million or 66.2%, from $0.3 million for the three months ended March 31, 2016 to $0.6 million for the three months ended March 31, 2017.

Provision for income taxes increased from $10.2 million for the three months ended March 31, 2016 to $11.6 million for the three months ended March 31, 2017.  The Company’s effective tax rate for the three months ended March 31, 2017 was 14.0% compared with 13.9% for the three months ended March 31, 2016.  The Company’s effective tax rate is principally a function of the distribution of pre-tax profits amongst the territories in which it operates.

23

Liquidity and Capital Resources

The CRO industry is generally not capital intensive.  The Group’s principal operating cash needs are payment of salaries, office rents, travel expenditures and payments to investigators. Investing activities primarily reflect capital expenditures for facilities and information systems enhancements, the purchase and sale of short term investments and acquisitions.

Our clinical research and development contracts are generally fixed price with some variable components and range in duration from a few weeks to several years. Revenue from contracts is generally recognized as income on the basis of the relationship between time incurred and the total estimated contract duration or on a fee-for-service basis.  The cash flow from contracts typically consists of a small down payment at the time the contract is entered into, with the balance paid in installments over the contract's duration, in some cases on the achievement of certain milestones.  Accordingly, cash receipts do not correspond to costs incurred and revenue recognized on contracts.

Cash and cash equivalents and net borrowings

	Balance 31 Dec 2016			Drawn down/ (repaid)		Net cash inflow/ (outflow)		Other non-cash adjustments			Effect of exchange rates		Balance 31 Mar 2017
$ in thousands
Cash and cash equivalents		192,541			-		44,019		-			739		237,299
Bank borrowings		-			-		-		-			-		-
Private placement notes		(348,511	)		-		-		(93	)		-		(348,604	)
		(155,970	)		-		44,019		(93	)		739		(111,305	)

The Company’s cash and short term investment balances at March 31, 2017 amounted to $319.0 million compared with cash and short term investment balances of $260.6 million at December 31, 2016.  The Company’s cash and short term investment balances at March 31, 2017 comprised of cash and cash equivalents of $237.3 million and short-term investments of $81.7 million.  The Company’s cash and short term investment balances at December 31, 2016 comprised of cash and cash equivalents of $192.5 million and short-term investments of $68.0 million.

On December 15, 2015, ICON Investments Five Unlimited Company issued Senior Notes for aggregate gross proceeds of $350.0 million in a private placement.  The Senior Notes will mature on December 15, 2020.  Interest payable is fixed at 3.64%, and is payable semi-annually on the Senior Notes on each June 15 and December 15, commencing June 15, 2016.  The Senior Notes are guaranteed by ICON plc.

On June 30, 2014 the Company entered into a five year committed multi-currency Revolving Credit Facility for $100.0 million with Citibank, JP Morgan, Santander and Barclays Bank (“Revolving Credit Facility”).  Each bank subject to the agreement has committed $25 million to the facility, with equal terms and conditions in place with all institutions.  The facility is guaranteed by ICON plc.  The facility bears interest at LIBOR plus a margin. No amounts were drawn at March 31, 2017 or at December 31, 2016 in respect of the Revolving Credit Facility.  Amounts available to the Group under the facility at both March 31, 2017 and December 31, 2016 were therefore $100.0 million.

The Group also has an uncommitted short-term revolving credit facility of $30 million. No amounts were drawn under this facility at 31 December 2016 or at March 31, 2017.

Net cash provided by operating activities was $159.3 million for the three months ended March 31, 2017 compared with cash provided by operating activities of $59.3 million for the three months ended March 31, 2016.  The positive cash flow impact of the increase in revenues and underlying profitability of the Company was enhanced by a decrease in revenue outstanding which comprises of accounts receivable and unbilled revenue, less payments on account.  The dollar value of these balances and the related number of days revenue outstanding (i.e. revenue outstanding as a percentage of revenue for the period, multiplied by the number of days in the period) can vary over a study or trial duration.  Contract fees are generally payable in instalments based on the delivery of certain performance targets or “milestones” (e.g. target patient enrolment rates, clinical testing sites initiated or case report forms completed), such milestones being specific to the terms of each individual contract, while revenues on contracts are recognized as contractual obligations are performed.  Days revenue outstanding can vary therefore due to, amongst others, the scheduling of contractual milestones over a study or trial duration, the delivery of a particular milestone during the period or the timing of cash receipts from customers.  A decrease in the number of days revenue outstanding during a period will result in cash inflows to the Company while an increase in days revenue outstanding will lead to cash outflows.  The number of days revenue outstanding at March 31, 2017 was 47 days compared to 50 days at December 31, 2016.  The number of days revenue outstanding at March 31, 2016 was 47 days compared to 41 days at December 31, 2015.

24

Net cash used in investing activities was $21.6 million for the three months ended March 31, 2017 compared to net cash used in investing activities of $7.6 million for the three months ended March 31, 2016.  Net cash used in the three months ended March 31, 2017 relates to capital expenditure of $8.2 million, which was mainly comprised of investment in facilities and IT infrastructure.  During the three months ended March 31, 2017 $18.0 million was used for the purchase of short term investments and $4.7 million was generated by the sale of short term investments.  Net cash used in investing activities during the three months ended March 31, 2016 principally relates to capital expenditure of $7.7 million, which mainly comprised of expenditure on global infrastructure and information technology systems to support the Company’s growth.

Net cash used in financing activities during the three months ended March 31, 2017 amounted to $93.7 million compared to net cash provided by financing activities of $5.3 million for the three months ended March 31, 2016.  Cash outflows in respect of financing includes cash payments in respect of the Company’s share repurchase program totaling $96.5 million during the three months ended March 31, 2017.  In addition, $2.8 million was received by the Company from the exercise of share options.  During the three months ended March 31, 2016, $1.1 million was received from the exercise of share options and $4.2 million was recognized in relation to the tax benefit from the exercise of share options.

As a result of these cash flows, cash and cash equivalents increased by $44.8 million for the three months ended March 31, 2017 compared to an increase of $57.4 million for the three months ended March 31, 2016.

Inflation

We believe the effects of inflation generally do not have a material adverse impact on our operations or financial condition.

Legal Proceedings

We are not party to any litigation or other legal proceedings that we believe could reasonably be expected to have a material adverse effect on our business, results of operations and financial condition.

25

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ICON plc
	/s/Brendan Brennan
Date: April 27, 2017	Brendan Brennan
	Chief Financial Officer

26

XML

Document and Entity Information	3 Months Ended
	Mar. 31, 2017
Document Information [Line Items]
Document Type	6-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	ICLR
Entity Registrant Name	ICON PLC
Entity Central Index Key	0001060955
Current Fiscal Year End Date	--12-31

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 237,299	$ 192,541
Short term investments - available for sale	81,667	68,046
Accounts receivable, net	340,540	416,229
Unbilled revenue	226,152	192,687
Other receivables	35,800	32,044
Prepayments and other current assets	37,760	35,170
Income taxes receivable	22,988	21,241
Total current assets	982,206	957,958
Other Assets:
Property, plant and equipment, net	148,644	148,967
Goodwill	617,813	616,088
Non-current other assets	14,400	13,831
Non-current income taxes receivable	9,975	12,698
Non-current deferred tax asset	29,929	19,691
Intangible assets	52,248	56,610
Total Assets	1,855,215	1,825,843
Current Liabilities:
Accounts payable	13,591	8,696
Payments on account	266,704	272,757
Other liabilities	213,611	190,727
Income taxes payable	21,638	22,226
Total current liabilities	515,544	494,406
Other Liabilities:
Non-current bank credit lines and loan facilities	348,604	348,511
Non-current other liabilities	24,821	23,752
Non-current government grants	890	887
Non-current income taxes payable	16,457	8,482
Non-current deferred tax liability	4,390	4,631
Commitments and contingencies
Total Liabilities	910,706	880,669
Shareholders' Equity:
Ordinary shares, par value 6 euro cents per share; 100,000,000 shares authorized, 53,775,703 shares issued and outstanding at March 31, 2017 and 54,530,843 shares issued and outstanding at December 31, 2016	4,644	4,692
Additional paid-in capital	449,678	438,126
Other undenominated capital	887	809
Accumulated other comprehensive income	(80,152)	(86,300)
Retained earnings	569,452	587,847
Total Shareholders' Equity	944,509	945,174
Total Liabilities and Shareholders' Equity	$ 1,855,215	$ 1,825,843

XML

Condensed Consolidated Balance Sheets (Parenthetical) - € / shares	Mar. 31, 2017	Dec. 31, 2016
Ordinary shares, par value	€ 0.06	€ 0.06
Ordinary shares, shares authorized	100,000,000	100,000,000
Ordinary shares, shares issued	53,775,703	54,530,843
Ordinary shares, shares outstanding	53,775,703	54,530,843

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Gross revenue	$ 578,066	$ 542,583
Reimbursable expenses	(146,112)	(142,061)
Net revenue	431,954	400,522
Costs and expenses:
Direct costs	250,459	228,603
Selling, general and administrative expense	81,389	80,789
Depreciation and amortization	14,448	15,120
Total costs and expenses	346,296	324,512
Income from operations	85,658	76,010
Interest income	555	334
Interest expense	(3,179)	(3,215)
Income before provision for income taxes	83,034	73,129
Provision for income taxes	(11,625)	(10,165)
Net income	$ 71,409	$ 62,964
Net income per Ordinary Share:
Basic	$ 1.31	$ 1.14
Diluted	$ 1.29	$ 1.12
Weighted average number of Ordinary Shares outstanding:
Basic	54,372,931	55,011,019
Diluted	55,371,826	56,242,164

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 71,409	$ 62,964
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of property, plant and equipment		7
Depreciation expense	10,018	10,161
Amortization of intangibles	4,430	4,959
Amortization of government grants	(10)	(11)
Interest on short term investments	(251)	(210)
Stock compensation expense	8,809	9,591
Amortization of gain on interest rate hedge	(230)	(210)
Amortization of financing costs	140	130
Deferred taxes	(3,593)	(4,859)
Changes in assets and liabilities:
Decrease in accounts receivable	76,478	47,407
Increase in unbilled revenue	(32,944)	(64,516)
Increase in other receivables	(3,103)	(3,730)
(Increase)/decrease in prepayments and other current assets	(2,522)	1,586
Increase in other non-current assets	(526)	(1,413)
Decrease in payments on account	(6,115)	(687)
Increase/(decrease) in other current liabilities	22,568	(10,612)
Increase in other non-current liabilities	1,082	1,520
Increase in income taxes payable	8,839	8,626
Increase/(decrease) in accounts payable	4,848	(1,383)
Net cash provided by operating activities	159,327	59,320
Cash flows from investing activities:
Purchase of property, plant and equipment	(8,298)	(7,658)
Purchase of short term investments	(17,977)	(98)
Sale of short term investments	4,675	158
Net cash used in investing activities	(21,600)	(7,598)
Cash flows from financing activities:
Proceeds from exercise of equity compensation	2,780	1,137
Share issue costs	(7)
Excess tax benefit on exercise of equity compensation		4,241
Repurchase of ordinary shares	(96,404)
Share repurchase costs	(77)
Net cash provided by financing activities	(93,708)	5,378
Effect of exchange rate movements on cash	739	326
Net increase in cash and cash equivalents	44,758	57,426
Cash and cash equivalents at beginning of period	192,541	103,911
Cash and cash equivalents at end of period	$ 237,299	$ 161,337

XML

Condensed Consolidated Statements of Shareholders' Equity and Comprehensive Income - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Ordinary Shares	Additional Paid-in Capital	Other Undenominated Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance (in shares) at Dec. 31, 2016	54,530,843	54,530,843
Balance at Dec. 31, 2016	$ 945,174	$ 4,692	$ 438,126	$ 809	$ (86,300)	$ 587,847
Comprehensive income:
Net income	71,409					71,409
Currency translation adjustment	4,275				4,275
Currency impact of long term funding	1,962				1,962
Tax on currency impact of long term funding	73				73
Unrealized capital gain - investments	68				68
Amortization of interest rate hedge	(230)				(230)
Total comprehensive income	77,557				6,148	71,409
Exercise of share options (in shares)		121,210
Exercise of share options	2,758	$ 8	2,750
Issue of restricted share units (in shares)		345,379
Issue of restricted share units	22	$ 22
Share issuance costs	(7)		(7)
Non-cash stock compensation expense	8,809		8,809
Share repurchase program	(96,404)	$ (78)		78		(96,404)
Share repurchase program (in shares)		(1,221,729)
Share repurchase costs	$ (77)					(77)
Balance (in shares) at Mar. 31, 2017	53,775,703	53,775,703
Balance at Mar. 31, 2017	$ 944,509	$ 4,644	$ 449,678	$ 887	$ (80,152)	569,452
Comprehensive income:
Cumulative effect adjustment from adoption of ASU 2016-09	$ 6,677					$ 6,677

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2017

Basis of Presentation

1. Basis of Presentation

These condensed consolidated financial statements which have been prepared in accordance with United States Generally Accepted Accounting Principles (“US GAAP”) have not been audited. The condensed consolidated financial statements reflect all adjustments, which are, in the opinion of management, necessary to present a fair statement of the operating results and financial position for the periods presented. The preparation of the condensed consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures in the condensed consolidated financial statements.  Actual results could differ from those estimates.

The condensed consolidated financial statements should be read in conjunction with the accounting policies and notes to the consolidated financial statements included in ICON’s Form 20-F for the year ended December 31, 2016. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the fiscal period ending December 31, 2017.

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Goodwill

3 Months Ended

Mar. 31, 2017

Goodwill

2. Goodwill

	Three months ended		Year ended
	March 31,		December 31,
	2017		2016
	(in thousands)
Opening balance	$	616,088	$	588,434
Current period acquisitions (Note 3)		-		34,576
Prior period acquisitions (Note 3)		-		7,689
Foreign exchange movement		1,725		(14,611	)
Closing balance	$	617,813	$	616,088

XML

Business Combinations

3 Months Ended

Mar. 31, 2017

Business Combinations

3. Business Combinations

Acquisitions – Clinical Research Management, Inc.

On September 15, 2016, a subsidiary of the Company, ICON US Holdings Inc. acquired ClinicalRM resulting in an initial net cash outflow of $52.4 million inclusive of certain payments made on behalf of ClinicalRM totaling $9.2 million.

ClinicalRM is a full-service CRO specializing in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. The organization helps customers progress their products to market faster with a wide array of research, regulatory and sponsor services within the U.S. and around the globe. ClinicalRM provide full service and functional research solutions to a broad range of US government agencies. Their extensive expertise extends across basic and applied research, infectious diseases, vaccines development and testing and the response to bio-threats.  They have worked in collaboration with government and commercial customers to respond to the threat of global viral epidemics.  Further consideration of up to $12.0 million is payable if certain performance milestones are achieved in respect of periods up to December 31, 2017.  The fair value of the deferred consideration on acquisition and at March 31, 2017 has been estimated at $6 million.

The acquisition of ClinicalRM has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations. The Company has made a provisional assessment of the fair value of assets acquired and liabilities assumed as at that date. The table following summarizes the Company’s provisional estimates of the fair values of the assets acquired and liabilities assumed:

	September 15,
	2016
	(in thousands)
Cash	$	3,168
Property, plant and equipment		939
Goodwill*		34,576
Intangible assets**		8,644
Accounts receivable		11,725
Unbilled revenue		2,814
Prepayments and other current assets		1,673
Accounts payable		(621	)
Other liabilities		(4,515	)
Non-current other liabilities		(7	)
Net assets acquired	$	58,396
Cash outflows (including other liabilities assumed of $9.2 million)	$	52,396
Contingent consideration		6,000
Total cash outflows	$	58,396

*Goodwill represents the acquisition of an established workforce with experience in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. Goodwill related to the US portion of the business acquired is tax deductible.

**The Company has made an initial estimate of separate intangible assets acquired of $8.6 million, being customer relationships and order book assets.  This assessment is under review and will be finalized within 12 months of the date of acquisition.

Acquisitions - PMG

On December 4, 2015, a subsidiary of the Company, ICON Clinical Research LLC. acquired PMG for total cash outflows of $65.4 million, including certain payments made on behalf of PMG totaling $10.1 million.  PMG is an integrated network of 52 clinical research sites in North Carolina, South Carolina, Tennessee, Illinois and Iowa.  The site network includes wholly owned facilities and dedicated clinical research sites. PMG conducts clinical trials in all major therapeutic areas and has particular expertise in vaccine, gastroenterology, cardiovascular, neurology and endocrinology studies.  It has a proprietary database of clinical trial participants.  It also has access to in excess of 2 million active patients via electronic medical records through its partnerships with healthcare institutions and community physical practices.

The acquisition of PMG has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations.  The table following summarizes the fair values of the assets acquired and liabilities assumed:

	December 4,
	2015
	(in thousands)
Cash	$	194
Property, plant and equipment		712
Goodwill*		48,728
Customer lists		6,938
Order backlog		2,948
Accounts receivable		11,597
Prepayments and other current assets		1,329
Accounts payable		(530	)
Other liabilities		(3,456	)
Non-current deferred tax liability		(3,106	)
Net assets acquired	$	65,354
Cash consideration	$	53,681
Other liabilities assumed		10,060
Working capital adjustment		1,613
Total cash outflows	$	65,354

*Goodwill represents the acquisition of an established workforce with experience in clinical trial consulting and regulatory support for the development of drugs, medical devices and diagnostics, with a specific focus on strategy to increase efficiency and productivity in product development.   In finalizing the goodwill on acquisition of PMG in the twelve month period from acquisition, fair value adjustments were made to deferred tax liabilities ($3.1 million), accounts receivable acquired ($1.4 million), other liabilities ($1.2 million) and the value of the customer list and order backlog assets acquired ($0.4 million).  Additional consideration of $1.6 million was provided on completion of the contractual working capital process.

Acquisitions - MediMedia Pharma Solutions

On February 27, 2015, a subsidary of the Company, ICON Holdings Unlimited Company (formerly ICON Holdings), acquired MediMedia Pharma Solutions for cash consideration of $104.8 million (net of working capital adjustments of $3.9 million).  In addition to the cash consideration, certain payments were made on behalf of MediMedia Pharma Solutions on completion totaling $11.3 million. Headquartered in Yardley, Pennsylvania, MediMedia Pharma Solutions includes MediMedia Managed Markets and Complete Healthcare Communications.  MediMedia Managed Markets is a leading provider of strategic payer-validated market access solutions.  Complete Healthcare Communications is one of the leading medical and scientific communication agencies working with medical affairs, commercial and brand development teams within life science companies. The acquisition agreement also provided for certain working capital targets to be achieved by MediMedia Pharma Solutions.

The acquisition of MediMedia Pharma Solutions has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations. The table following summarizes the fair values of the assets acquired and liabilities assumed on acquisition:

	February 27,
	2015
	(in thousands)
Property, plant and equipment	$	1,049
Goodwill*		92,084
Customer lists		22,752
Order backlog		2,521
Accounts receivable		5,240
Unbilled revenue		4,324
Prepayments and other current assets		621
Accounts payable		(749	)
Payments on account		(4,186	)
Deferred tax liability		(2,171	)
Other liabilities		(5,483	)
Net assets acquired	$	116,002
Cash consideration	$	108,717
Other liabilities assumed**		11,283
Gross cash outflows		120,000
Working capital adjustment		(3,998	)
Net cash outflows	$	116,002

* Goodwill represents the acquisition of an established workforce with experience in the provision of strategic payer-validated market access solutions while the acquisition of Complete Healthcare Communications comprises an established workforce with significant communication experience working with medical affairs, commercial and brand development teams within the life science industry. Goodwill related to the US portion of the business is tax deductible.

** Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

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Restructuring

3 Months Ended

Mar. 31, 2017

Restructuring

4. Restructuring

Prior Periods Restructuring Charges

A restructuring charge of $8.2 million was recognized during the year ended December 31, 2016 under a restructuring plan adopted following a review by the Company of its operations.  The restructuring plan includes resource rationalizations in certain areas of the business to improve resource utilization, resulting in a charge of $6.2 million and office consolidation resulting in the recognition of an onerous lease obligation of $2.0 million during the twelve months ended December 31, 2016.  No additional charge was recorded during the three months ended March 31, 2017.

	Workforce				Onerous
	Reductions				Lease				Total
	(in thousands)
Total provision recognized		$	6,190			$	1,969			$	8,159
Utilized			(5,734	)			(571	)			(6,305	)
Foreign exchange			(63	)			-				(63	)
Provision at December 31, 2016		$	393			$	1,398			$	1,791
Utilized			(393	)			(375	)			(768	)
Provision at March 31, 2017			-			$	1,023			$	1,023

A restructuring charge of $8.8 million was recognized during the year ended December 31, 2014. Following the closure of the Company’s European Phase 1 services in 2013, the Company recognized a charge in 2014 in relation to its Manchester, United Kingdom facility; $5.6 million in relation to asset impairments and $3.2 million in relation to an onerous lease charge associated with this facility. We expect this to be paid by 2024.

	Asset			Onerous
	Impairment			Lease			Total
	(in thousands)
Total provision recognized	$	5,629		$	3,167		$	8,796
Asset write-off		(5,629	)		-			(5,629	)
Provision at December 31, 2014		-		$	3,167		$	3,167
Utilized		-			(1,167	)		(1,167	)
Provision at December 31, 2015		-			2,000			2,000
Utilized		-			(1,359	)		(1,359	)
Provision at December 31, 2016		-			641			641
Utilized		-			(149	)		(149	)
Provision at March 31, 2017		-			492			492

At March 31, 2017, $1.0 million is included within other liabilities and $0.5 million within non-current other liabilities.

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Income Taxes

3 Months Ended

Mar. 31, 2017

Income Taxes

5. Income Taxes

Income taxes recognized during the three months ended March 31, 2017 comprise:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Provision for income taxes	$	11,625	$	10,165

As at March 31, 2017 the Company maintains a $30.6 million liability (December 31, 2016: $29.9 million) for unrecognized tax benefit, which is comprised of $27.2 million (December 31, 2016: $26.6 million) related to items generating unrecognized tax benefits and $3.4 million (December 31, 2016: $3.3 million) for interest and related penalties to such items.  The Company recognizes interest accrued on unrecognized tax benefits as an additional income tax expense.

The Company has analyzed the filing positions in all of the significant federal, state and foreign jurisdictions where it is required to file income tax returns, as well as open tax years in these jurisdictions.  The only periods subject to examination by the major tax jurisdictions where the Company does business are 2012 through 2016 tax years.  The Company does not believe that the outcome of any examination will have a material impact on its financial statements.

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Net income per ordinary share

3 Months Ended

Mar. 31, 2017

Net income per ordinary share

6. Net income per ordinary share

Basic net income per ordinary share has been computed by dividing net income available to ordinary shareholders by the weighted average number of ordinary shares outstanding during the period.  Diluted net income per ordinary share is computed by adjusting the weighted average number of ordinary shares outstanding during the period for all potentially dilutive ordinary shares outstanding during the period and adjusting net income for any changes in income or loss that would result from the conversion of such potential ordinary shares.  There is no difference in net income used for basic and diluted net income per ordinary share.

The reconciliation of the number of shares used in the computation of basic and diluted net income per ordinary share is as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
Weighted average number of ordinary shares outstanding for basic net income per ordinary share		54,372,931		55,011,019
Effect of dilutive share options outstanding		998,895		1,231,145
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share		55,371,826		56,242,164

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Share-based Awards

3 Months Ended

Mar. 31, 2017

Share-based Awards

7. Share-based Awards

Share Options

On July 21, 2008 the Company adopted the Employee Share Option Plan 2008 (the “2008 Employee Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may grant options to any employee, or any Director holding a salaried office or employment with the Company or a Subsidiary for the purchase of ordinary shares.  On the same date, the Company also adopted the Consultants Share Option Plan 2008 (the “2008 Consultants Plan”), pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may grant options to any consultant, adviser or non-executive Director retained by the Company or any Subsidiary for the purchase of ordinary shares.

On February 14, 2017 both the 2008 Employee Plan and the 2008 Consultants Plan (together the “2008 Option Plans”) were amended and restated in order to increase the number of options that can be issued under the 2008 Consultants Plan from 400,000 to 1 million and to extend the date for options to be granted under the 2008 Option Plans.

Each option granted under the 2008 Option Plans will be an employee stock option, or Non-qualifying Stock Options (‘NSO’), as described in Section 422 or 423 of the Internal Revenue Code.  Each grant of an option under the 2008 Options Plans will be evidenced by a Stock Option Agreement between the optionee and the Company.  The exercise price will be specified in each Stock Option Agreement, however option prices will not be less than 100% of the fair market value of an ordinary share on the date the option is granted.

An aggregate of 6 million ordinary shares have been reserved under the 2008 Employee Plan, as reduced by any shares issued or to be issued pursuant to options granted under the 2008 Consultants Plan, under which a limit of 1 million shares applies.  Further, the maximum number of ordinary shares with respect to which options may be granted under the 2008 Employee Option Plan, during any calendar year to any employee shall be 400,000 ordinary shares.  There is no individual limit under the 2008 Consultants Plan.  No options may be granted under the 2008 Option Plans after February 14, 2027.

On January 17, 2003 the Company adopted the Share Option Plan 2003 (the “2003 Share Option Plan”) pursuant to which the Compensation and Organization Committee of the Board could grant options to officers and other employees of the Company or its subsidiaries for the purchase of ordinary shares.  An aggregate of 6 million ordinary shares were reserved under the 2003 Share Option Plan; and, in no event could the number of ordinary shares issued pursuant to options awarded under this plan exceed 10% of the outstanding shares, as defined in the 2003 Share Option Plan, at the time of the grant, unless the Board expressly determined otherwise.  Further, the maximum number of ordinary shares with respect to which options could be granted under the 2003 Share Option Plan during any calendar year to any employee was 400,000 ordinary shares.  The 2003 Share Option Plan expired on January 17, 2013.  No new options may be granted under this plan.

Share option awards are granted with an exercise price equal to the market price of the Company’s shares at date of grant. Share options typically vest over a period of five years from date of grant and expire eight years from date of grant. The maximum contractual term of options outstanding at March 31, 2017 is eight years.

The following table summarizes option activity for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value		Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		1,466,444		$	43.45	$	13.94
Granted		135,243		$	83.47	$	24.49
Exercised		(121,210	)	$	22.75	$	8.71
Forfeited		(10,347	)	$	41.44	$	13.42
Outstanding at March 31, 2017		1,470,130		$	48.86	$	15.35		4.96
Exercisable at March 31, 2017		682,269		$	36.53	$	12.35		3.79

The Company has outstanding options with fair values ranging from $6.72 to $24.49 per option or a weighted average fair value of $11.12 per option.  The Company issues ordinary shares for all options exercised.  The total amount of fully vested share options which remained outstanding at March 31, 2017, was 682,269.  Fully vested share options at March 31, 2017, have an average remaining contractual term of 3.79 years, an average exercise price of $36.53 and a total intrinsic value of $29.5 million.  The total intrinsic value of options exercised during the three months ended March 31, 2017 was $7.4 million (March 31, 2016: $2.2 million).

The following table summarizes the movement in non-vested share options for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value
Non-vested outstanding at December 31, 2016		814,870		$	54.37	$	16.55
Granted		135,243		$	83.47	$	24.49
Vested		(152,865	)	$	54.19	$	16.55
Forfeited		(9,387	)	$	43.40	$	13.86
Non-vested outstanding at March 31, 2017		787,861		$	59.53	$	17.94

Fair value of Stock Options Assumptions

The weighted average fair value of options granted during the three months ended March 31, 2017 and March 31, 2016 was calculated using the Black-Scholes option pricing model.  The weighted average fair values and assumptions used were as follows:

	Three Months Ended
	March 31,			March 31,
	2017			2016
Weighted average fair value	$	24.49		$	20.78
Assumptions:
Expected volatility		29	%		30	%
Dividend yield		0	%		0	%
Risk-free interest rate		2.05	%		1.39	%
Expected life	5 years			5 years

Expected volatility is based on the historical volatility of our common stock over a period equal to the expected term of the options; the expected life represents the weighted average period of time that options granted are expected to be outstanding given consideration to vesting schedules and our historical experience of past vesting and termination patterns. The risk-free rate is based on the U.S. government zero-coupon bonds yield curve in effect at time of the grant for periods corresponding with the expected life of the option.

Restricted Share Units and Performance Share Units

On July 21, 2008 the Company adopted the 2008 Employees Restricted Share Unit Plan (the “2008 RSU Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may select any employee, or any Director holding a salaried office or employment with the Company, or a Subsidiary to receive an award under the plan. An aggregate of 1.0 million ordinary shares have been reserved for issuance under the 2008 RSU Plan.

On April 23, 2013 the Company adopted the 2013 Employees Restricted Share Unit (“RSU”) and Performance Share Unit (“PSU”) Plan (the “2013 RSU Plan”) pursuant to which the Compensation and Organization Committee of the Company’s Board of Directors may select any employee, or any Director holding a salaried office or employment with the Company, or a Subsidiary to receive an award under the plan.  On May 11, 2015 the 2013 RSU Plan was amended and restated in order to increase the number of shares that can be issued under the RSU Plan by 2.5 million shares.  Accordingly, an aggregate of 4.1 million ordinary shares have been reserved for issuance under the 2013 RSU Plan.  The shares are awarded at par value and vest over a service period.  Awards under the 2013 RSU Plan may be settled in cash or shares at the option of the Company.

The Company has awarded RSUs and PSUs to certain key individuals of the Group.  The following table summarizes RSU and PSU activity for the three months ended March 31, 2017:

	PSU Outstanding Number of Shares			PSU Weighted Average Fair Value		PSU Weighted Average Remaining Contractual Life		RSU Outstanding Number of Shares			RSU Weighted Average Fair Value		RSU Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		830,523		$	60.73		1.11		1,025,484		$	58.64		1.40
Granted		79,346		$	83.47				39,146		$	83.47
Shares vested		(308,144	)	$	46.86				(37,235	)	$	61.80
Forfeited		(11,154	)	$	51.35				(37,522	)	$	55.53
Outstanding at March 31, 2017		590,571		$	70.39		1.59		989,873		$	59.62		1.23

The fair value of RSUs vested for the three months ended March 31, 2017 totaled $2.3 million (full year 2016: $10.8 million).

The fair value of PSUs vested for the three months ended March 31, 2017 totaled $14.4 million (the fair value of PSUs vested for the full year 2016 was $10.3 million).

The PSUs vest based on service and specified EPS targets over the period 2014 – 2017, 2015 – 2018, 2016 – 2019 and 2017 – 2020.  Since 2013, 307,351 PSUs (net of forfeitures) have been granted.  Up to an additional 283,220 PSUs may also be granted, based on the actual EPS from 2014 to 2020.

Non-cash stock compensation expense

Non-cash stock compensation expense for the three months ended March 31, 2017 has been allocated as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Direct costs	$	4,854	$	5,285
Selling, general and administrative		3,955		4,306
	$	8,809	$	9,591

Total non-cash stock compensation expense not yet recognized at March 31, 2017 amounted to $63.2 million.  The weighted average period over which this is expected to be recognized is 2.2 years.

The amendments required by Accounting Standards Update (‘ASU’) 2016-09 ‘Improvements to Employee Share-Based Payment Accounting’ require the Company to record all tax effects related to share-based payments through the income statement rather than additional paid in capital.  The Company has applied the updated standard prospectively in the first quarter of the year ended December 31, 2017.

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Share Capital

3 Months Ended

Mar. 31, 2017

Share Capital

8. Share Capital

On October 3, 2016 the Company commenced a previously announced share buyback program of up to $400 million.  The Company can acquire up to 10% of its outstanding ordinary shares (by way of redemption), in accordance with Irish law, the United States securities laws, and the Company’s constitutional documents through open market share acquisitions.

The buyback program gives a broker authority to acquire the Company’s ordinary shares from time to time on the open market in accordance with agreed terms and limitations.  The acquisition of shares pursuant to the buyback program was effected by way of redemption and cancellation of the shares, in accordance with the Constitution of the Company.

During the three months ended March 31, 2017 1,221,729 ordinary shares were redeemed by the Company under this buyback program for a total consideration of $96.4 million.  At March 31, 2017 a total of 2,650,916 ordinary shares were redeemed by the Company under this buyback program for a total consideration of $206.4 million.  All ordinary shares that were redeemed under the buyback program were cancelled in accordance with the Constitution of the Company and the nominal value of these shares transferred to an other undenominated capital reserve as required under Irish Company Law.

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Business Segment Information

3 Months Ended

Mar. 31, 2017

Business Segment Information

9. Business Segment Information

The Company determines and presents operating segments based on the information that is internally provided to the chief operating decision maker, together the (‘CODM’) in accordance with FASB ASC 280-10 Disclosures about Segments of an Enterprises and Related Information.  The Chief Executive Officer, Chief Financial Officer and Chief Operating Officer, were together considered the Company’s CODM in the period up to and including March 1, 2017.  On March 1, 2017, Mr Ciaran Murray transitioned from his role as Chief Executive Officer to the role of Executive Chairman of the Board of Directors and Dr. Steve Cutler was appointed as Chief Executive Officer.  As of, March 1, 2017, the Company determined that the CODM is comprised of the Chief Executive Officer and the Chief Financial Officer.

The Company determines and presents operating segments based on the information that is provided to the CODM.  The Company has determined that we operate in one single business segment which is the provision of outsourced development services on a global basis to the pharmaceutical, biotechnology and medical devices industries.  There have been no changes to the basis of segmentation or the measurement basis for the segment results in the period.

The Company is a contract research organization (“CRO”), providing outsourced development services on a global basis to the pharmaceutical, biotechnology and medical device industries.  It specializes in the strategic development, management and analysis of programs that support all stages of the clinical development process - from compound selection to Phase I-IV clinical studies.  The Company has the expertise and capability to conduct clinical trials in most major therapeutic areas on a global basis and has the operational flexibility to provide development services on a stand-alone basis or as part of an integrated “full service” solution.  The Company has expanded predominately through internal growth together with a number of strategic acquisitions to enhance its expertise and capabilities in certain areas of the clinical development process.

The Company is generally awarded projects based upon responses to requests for proposals received from companies in the pharmaceutical, biotechnology and medical device industries or work orders executed under our strategic partnership arrangements.  Contracts with customers are generally entered into centrally, in most cases with ICON Clinical Research Limited (“ICON Ireland”), the Company’s principal operating subsidiary in Ireland.  Revenues, which consist primarily of fees earned under these contracts, are allocated to individual entities within the Group, based on where the work is performed in accordance with the Company’s global transfer pricing model.

ICON Ireland acts as the group entrepreneur under the Company’s global transfer pricing model given its role in the development and management of the group, it’s ownership of key intellectual property and customer relationships, its key role in the mitigation of risks faced by the group and its responsibility for maintaining the Company’s global network.  ICON Ireland enters into the majority of the Company’s customer contracts.

ICON Ireland remunerates other operating entities in the ICON Group on the basis of a guaranteed cost plus mark up for the services they perform in each of their local territories.  The cost plus mark up for each ICON entity is established to ensure that each of ICON Ireland and the ICON entities that are involved in the conduct of services for customers, earn an appropriate arms-length return having regard to the assets owned, risks borne, and functions performed by each entity from these intercompany transactions.  The cost plus mark-up policy is reviewed annually to ensure that it is market appropriate.

The geographic split of revenue disclosed for each region outside Ireland is the cost plus revenue attributable to these entities.  The residual revenues of the Group, once each ICON entity has been paid its respective intercompany service fee, generally fall to be retained by ICON Ireland.  As such revenues and income from operations in Ireland are a function of this global transfer pricing model and comprise net revenues of the Group after deducting the cost plus revenues attributable to the activities performed outside Ireland.

The Company's areas of operation outside of Ireland include the United States, United Kingdom, Belgium, France, Germany, Italy, Spain, The Netherlands, Sweden, Turkey, Poland, Czech Republic, Latvia, Russia, Ukraine, Hungary, Israel, Romania, Switzerland, Canada, Mexico, Brazil, Colombia, Argentina, Chile, Peru, India, China, South Korea, Japan, Thailand, Taiwan, Singapore, The Philippines, Australia, New Zealand, and South Africa.

The geographical distribution of the Company’s segment measures as at March 31, 2017 and December 31, 2016 and for the three months ended March 31, 2017 and March 31, 2016 is as follows:

a) The distribution of net revenue by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	109,205	$	100,835
Rest of Europe		71,453		75,642
U.S.		201,615		184,090
Rest of World		49,681		39,955
Total	$	431,954	$	400,522

* All sales shown for Ireland are export sales.

b) The distribution of income from operations, by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	63,968	$	59,551
Rest of Europe		3,699		3,444
U.S.		10,499		10,784
Rest of World		7,492		2,231
Total	$	85,658	$	76,010

c) The distribution of property, plant and equipment, net, by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	105,836	$	105,684
Rest of Europe		5,949		6,231
U.S.		27,931		29,428
Rest of World		8,928		7,624
Total	$	148,644	$	148,967

d) The distribution of depreciation and amortization by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	5,972	$	5,904
Rest of Europe		1,658		1,715
U.S.		5,948		6,649
Rest of World		870		852
Total	$	14,448	$	15,120

e) The distribution of total assets by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	803,421	$	766,120
Rest of Europe		356,355		337,062
U.S.		628,012		651,160
Rest of World		67,427		71,501
Total	$	1,855,215	$	1,825,843

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Goodwill (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill

	Three months ended		Year ended
	March 31,		December 31,
	2017		2016
	(in thousands)
Opening balance	$	616,088	$	588,434
Current period acquisitions (Note 3)		-		34,576
Prior period acquisitions (Note 3)		-		7,689
Foreign exchange movement		1,725		(14,611	)
Closing balance	$	617,813	$	616,088

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Business Combinations (Tables)

3 Months Ended

Mar. 31, 2017

Clinical Research Management Inc.

Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed

The table following summarizes the Company’s provisional estimates of the fair values of the assets acquired and liabilities assumed:

	September 15,
	2016
	(in thousands)
Cash	$	3,168
Property, plant and equipment		939
Goodwill*		34,576
Intangible assets**		8,644
Accounts receivable		11,725
Unbilled revenue		2,814
Prepayments and other current assets		1,673
Accounts payable		(621	)
Other liabilities		(4,515	)
Non-current other liabilities		(7	)
Net assets acquired	$	58,396
Cash outflows (including other liabilities assumed of $9.2 million)	$	52,396
Contingent consideration		6,000
Total cash outflows	$	58,396

*Goodwill represents the acquisition of an established workforce with experience in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. Goodwill related to the US portion of the business acquired is tax deductible.

**The Company has made an initial estimate of separate intangible assets acquired of $8.6 million, being customer relationships and order book assets.  This assessment is under review and will be finalized within 12 months of the date of acquisition.

PMG

Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed

The acquisition of PMG has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations.  The table following summarizes the fair values of the assets acquired and liabilities assumed:

	December 4,
	2015
	(in thousands)
Cash	$	194
Property, plant and equipment		712
Goodwill*		48,728
Customer lists		6,938
Order backlog		2,948
Accounts receivable		11,597
Prepayments and other current assets		1,329
Accounts payable		(530	)
Other liabilities		(3,456	)
Non-current deferred tax liability		(3,106	)
Net assets acquired	$	65,354
Cash consideration	$	53,681
Other liabilities assumed		10,060
Working capital adjustment		1,613
Total cash outflows	$	65,354

*Goodwill represents the acquisition of an established workforce with experience in clinical trial consulting and regulatory support for the development of drugs, medical devices and diagnostics, with a specific focus on strategy to increase efficiency and productivity in product development.   In finalizing the goodwill on acquisition of PMG in the twelve month period from acquisition, fair value adjustments were made to deferred tax liabilities ($3.1 million), accounts receivable acquired ($1.4 million), other liabilities ($1.2 million) and the value of the customer list and order backlog assets acquired ($0.4 million).  Additional consideration of $1.6 million was provided on completion of the contractual working capital process.

MediMedia Pharma Solutions

Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed

The acquisition of MediMedia Pharma Solutions has been accounted for as a business combination in accordance with FASB ASC 805 Business Combinations. The table following summarizes the fair values of the assets acquired and liabilities assumed on acquisition:

	February 27,
	2015
	(in thousands)
Property, plant and equipment	$	1,049
Goodwill*		92,084
Customer lists		22,752
Order backlog		2,521
Accounts receivable		5,240
Unbilled revenue		4,324
Prepayments and other current assets		621
Accounts payable		(749	)
Payments on account		(4,186	)
Deferred tax liability		(2,171	)
Other liabilities		(5,483	)
Net assets acquired	$	116,002
Cash consideration	$	108,717
Other liabilities assumed**		11,283
Gross cash outflows		120,000
Working capital adjustment		(3,998	)
Net cash outflows	$	116,002

* Goodwill represents the acquisition of an established workforce with experience in the provision of strategic payer-validated market access solutions while the acquisition of Complete Healthcare Communications comprises an established workforce with significant communication experience working with medical affairs, commercial and brand development teams within the life science industry. Goodwill related to the US portion of the business is tax deductible.

** Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

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Restructuring (Tables)

3 Months Ended

Mar. 31, 2017

Restructuring Charges

	Workforce				Onerous
	Reductions				Lease				Total
	(in thousands)
Total provision recognized		$	6,190			$	1,969			$	8,159
Utilized			(5,734	)			(571	)			(6,305	)
Foreign exchange			(63	)			-				(63	)
Provision at December 31, 2016		$	393			$	1,398			$	1,791
Utilized			(393	)			(375	)			(768	)
Provision at March 31, 2017			-			$	1,023			$	1,023

Asset			Onerous
	Impairment			Lease			Total
	(in thousands)
Total provision recognized	$	5,629		$	3,167		$	8,796
Asset write-off		(5,629	)		-			(5,629	)
Provision at December 31, 2014		-		$	3,167		$	3,167
Utilized		-			(1,167	)		(1,167	)
Provision at December 31, 2015		-			2,000			2,000
Utilized		-			(1,359	)		(1,359	)
Provision at December 31, 2016		-			641			641
Utilized		-			(149	)		(149	)
Provision at March 31, 2017		-			492			492

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2017

Income Taxes Recognized During Period

Income taxes recognized during the three months ended March 31, 2017 comprise:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Provision for income taxes	$	11,625	$	10,165

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Net income per ordinary share (Tables)

3 Months Ended

Mar. 31, 2017

Reconciliation of Number of Shares Used in Computation of Basic and Diluted Net Income Per Ordinary Share

The reconciliation of the number of shares used in the computation of basic and diluted net income per ordinary share is as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
Weighted average number of ordinary shares outstanding for basic net income per ordinary share		54,372,931		55,011,019
Effect of dilutive share options outstanding		998,895		1,231,145
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share		55,371,826		56,242,164

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Share-based Awards (Tables)

3 Months Ended

Mar. 31, 2017

Summary of Stock Option Activity

The following table summarizes option activity for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value		Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		1,466,444		$	43.45	$	13.94
Granted		135,243		$	83.47	$	24.49
Exercised		(121,210	)	$	22.75	$	8.71
Forfeited		(10,347	)	$	41.44	$	13.42
Outstanding at March 31, 2017		1,470,130		$	48.86	$	15.35		4.96
Exercisable at March 31, 2017		682,269		$	36.53	$	12.35		3.79

Summary of Movement in Non-Vested Share Options

The following table summarizes the movement in non-vested share options for the three months ended March 31, 2017:

	Options Outstanding Number of Shares			Weighted Average Exercise Price		Weighted Average Fair Value
Non-vested outstanding at December 31, 2016		814,870		$	54.37	$	16.55
Granted		135,243		$	83.47	$	24.49
Vested		(152,865	)	$	54.19	$	16.55
Forfeited		(9,387	)	$	43.40	$	13.86
Non-vested outstanding at March 31, 2017		787,861		$	59.53	$	17.94

Weighted Average Fair Values and Assumptions Used

The weighted average fair values and assumptions used were as follows:

	Three Months Ended
	March 31,			March 31,
	2017			2016
Weighted average fair value	$	24.49		$	20.78
Assumptions:
Expected volatility		29	%		30	%
Dividend yield		0	%		0	%
Risk-free interest rate		2.05	%		1.39	%
Expected life	5 years			5 years

RSU and PSU Activity

The following table summarizes RSU and PSU activity for the three months ended March 31, 2017:

	PSU Outstanding Number of Shares			PSU Weighted Average Fair Value		PSU Weighted Average Remaining Contractual Life		RSU Outstanding Number of Shares			RSU Weighted Average Fair Value		RSU Weighted Average Remaining Contractual Life
Outstanding at December 31, 2016		830,523		$	60.73		1.11		1,025,484		$	58.64		1.40
Granted		79,346		$	83.47				39,146		$	83.47
Shares vested		(308,144	)	$	46.86				(37,235	)	$	61.80
Forfeited		(11,154	)	$	51.35				(37,522	)	$	55.53
Outstanding at March 31, 2017		590,571		$	70.39		1.59		989,873		$	59.62		1.23

Schedule of Non-cash Stock Compensation Expense

Non-cash stock compensation expense for the three months ended March 31, 2017 has been allocated as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Direct costs	$	4,854	$	5,285
Selling, general and administrative		3,955		4,306
	$	8,809	$	9,591

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Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Distribution of Net Revenue by Geographical Area

a) The distribution of net revenue by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	109,205	$	100,835
Rest of Europe		71,453		75,642
U.S.		201,615		184,090
Rest of World		49,681		39,955
Total	$	431,954	$	400,522

* All sales shown for Ireland are export sales.

Distribution of Income from Operations by Geographical Area

b) The distribution of income from operations, by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	63,968	$	59,551
Rest of Europe		3,699		3,444
U.S.		10,499		10,784
Rest of World		7,492		2,231
Total	$	85,658	$	76,010

Distribution of Property, Plant and Equipment, Net, by Geographical Area

c) The distribution of property, plant and equipment, net, by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	105,836	$	105,684
Rest of Europe		5,949		6,231
U.S.		27,931		29,428
Rest of World		8,928		7,624
Total	$	148,644	$	148,967

Distribution of Depreciation and Amortization by Geographical Area

d) The distribution of depreciation and amortization by geographical area was as follows:

	Three Months Ended
	March 31,		March 31,
	2017		2016
	(in thousands)
Ireland	$	5,972	$	5,904
Rest of Europe		1,658		1,715
U.S.		5,948		6,649
Rest of World		870		852
Total	$	14,448	$	15,120

Distribution of Total Assets by Geographical Area

e) The distribution of total assets by geographical area was as follows:

	March 31,		December 31,
	2017		2016
	(in thousands)
Ireland	$	803,421	$	766,120
Rest of Europe		356,355		337,062
U.S.		628,012		651,160
Rest of World		67,427		71,501
Total	$	1,855,215	$	1,825,843

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Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Opening balance	$ 616,088	$ 588,434
Current period acquisitions (Note 3)		34,576
Prior period acquisitions (Note 3)		7,689
Foreign exchange movement	1,725	(14,611)
Closing balance	$ 617,813	$ 616,088

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Business Combinations - Additional Information (Detail) $ in Thousands		Sep. 15, 2016 USD ($)	Dec. 04, 2015 USD ($) Patient Site	Feb. 27, 2015 USD ($)	Mar. 31, 2017 USD ($)
Clinical Research Management Inc.
Business Acquisition [Line Items]
Net cash outflow		$ 52,400
Other liabilities assumed		9,200
Maximum additional consideration that might be payable		12,000
Fair Value of the deferred consideration on acquisition		6,000			$ 6,000
Total cash outflows		$ 58,396
PMG
Business Acquisition [Line Items]
Other liabilities assumed			$ 10,060
Total cash outflows			$ 65,354
Number of clinical research sites acquired | Site			52
Working capital adjustment			$ 1,613
PMG | Minimum
Business Acquisition [Line Items]
Number of active patients via electronic medical records acquired | Patient			2,000,000
MediMedia Pharma Solutions
Business Acquisition [Line Items]
Net cash outflow				$ 116,002
Other liabilities assumed	[1]			11,283
Cash consideration, net of working capital adjustment				104,800
Working capital adjustment				$ 3,998

[1] Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of Clinical Research Management, Inc. (Detail) - USD ($) $ in Thousands		Sep. 15, 2016	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 617,813	$ 616,088	$ 588,434
Clinical Research Management Inc.
Business Acquisition [Line Items]
Cash		$ 3,168
Property, plant and equipment		939
Goodwill	[1]	34,576
Intangible assets	[2]	8,644
Accounts receivable		11,725
Unbilled revenue		2,814
Prepayments and other current assets		1,673
Accounts payable		(621)
Other liabilities		(4,515)
Non-current other liabilities		(7)
Net assets acquired		58,396
Cash outflows (including other liabilities assumed of $9.2 million)		52,396
Contingent consideration		6,000	$ 6,000
Total cash outflows		$ 58,396

[1] *Goodwill represents the acquisition of an established workforce with experience in preclinical through Phase IV support of clinical research and clinical trial services for biologics, drugs and devices. Goodwill related to the US portion of the business acquired is tax deductible.

[2] **The Company has made an initial estimate of separate intangible assets acquired of $8.6 million, being customer relationships and order book assets. This assessment is under review and will be finalized within 12 months of the date of acquisition.

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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of Clinical Research Management, Inc. (Parenthetical) (Detail) - Clinical Research Management Inc. $ in Thousands	Sep. 15, 2016 USD ($)
Business Acquisition [Line Items]
Other liabilities assumed	$ 9,200
Intangible asset	$ 8,644	[1]

[1] **The Company has made an initial estimate of separate intangible assets acquired of $8.6 million, being customer relationships and order book assets. This assessment is under review and will be finalized within 12 months of the date of acquisition.

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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of PMG (Detail) - USD ($) $ in Thousands			13 Months Ended
		Dec. 04, 2015	Dec. 31, 2016	Mar. 31, 2017	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 616,088	$ 617,813	$ 588,434
PMG
Business Acquisition [Line Items]
Cash		$ 194
Property, plant and equipment		712
Goodwill	[1]	48,728
Accounts receivable		11,597
Prepayments and other current assets		1,329
Accounts payable		(530)
Other liabilities		(3,456)
Non-current deferred tax liability		(3,106)
Net assets acquired		65,354
Cash consideration		53,681	$ 1,600
Other liabilities assumed		10,060
Working capital adjustment		1,613
Total cash outflows		65,354
PMG | Customer Lists
Business Acquisition [Line Items]
Intangible assets		6,938
PMG | Order Backlog
Business Acquisition [Line Items]
Intangible assets		$ 2,948

[1] *Goodwill represents the acquisition of an established workforce with experience in clinical trial consulting and regulatory support for the development of drugs, medical devices and diagnostics, with a specific focus on strategy to increase efficiency and productivity in product development. In finalizing the goodwill on acquisition of PMG in the twelve month period from acquisition, fair value adjustments were made to deferred tax liabilities ($3.1 million), accounts receivable acquired ($1.4 million), other liabilities ($1.2 million) and the value of the customer list and order backlog assets acquired ($0.4 million). Additional consideration of $1.6 million was provided on completion of the contractual working capital process.

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Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed of PMG (Parenthetical) (Detail) - PMG - USD ($) $ in Thousands		13 Months Ended
	Dec. 04, 2015	Dec. 31, 2016
Business Acquisition [Line Items]
Fair value adjustment to deferred tax liability		$ 3,100
Fair value adjustment to accounts receivable		1,400
Fair value adjustment to other liabilities		1,200
Cash consideration	$ 53,681	1,600
Customer list and order backlog
Business Acquisition [Line Items]
Fair value adjustment to intangible assets		$ 400

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Summary of Fair Values of Assets Acquired and Liabilities Assumed of MediMedia Pharma Solutions (Detail) - USD ($) $ in Thousands		Feb. 27, 2015	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 617,813	$ 616,088	$ 588,434
MediMedia Pharma Solutions
Business Acquisition [Line Items]
Property, plant and equipment		$ 1,049
Goodwill	[1]	92,084
Accounts receivable		5,240
Unbilled revenue		4,324
Prepayments and other current assets		621
Accounts payable		(749)
Payments on account		(4,186)
Deferred tax liability		(2,171)
Other liabilities		(5,483)
Net assets acquired		116,002
Cash consideration		108,717
Other liabilities assumed	[2]	11,283
Gross cash outflows		120,000
Working capital adjustment		(3,998)
Net cash outflows		116,002
MediMedia Pharma Solutions | Customer Lists
Business Acquisition [Line Items]
Intangible asset		22,752
MediMedia Pharma Solutions | Order Backlog
Business Acquisition [Line Items]
Intangible asset		$ 2,521

[1] Goodwill represents the acquisition of an established workforce with experience in the provision of strategic payer-validated market access solutions while the acquisition of Complete Healthcare Communications comprises an established workforce with significant communication experience working with medical affairs, commercial and brand development teams within the life science industry. Goodwill related to the US portion of the business is tax deductible.

[2] Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

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Summary of Fair Values of Assets Acquired and Liabilities Assumed of MediMedia Pharma Solutions (Parenthetical) (Detail) $ in Thousands	Feb. 27, 2015 USD ($)
MediMedia Pharma Solutions
Business Acquisition [Line Items]
Other liabilities assumed	$ 11,283	[1]

[1] Payments made at acquisition date of $11.3 million were in respect of certain one-time liabilities which have subsequently been discharged.

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Restructuring - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 8,159,000
Other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve,current	1,000,000
Non-current other liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Noncurrent	$ 500,000
Onerous Lease | Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,969,000
Workforce Reduction | Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 6,190,000
Manchester, United Kingdom facility closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 8,796,000
Manchester, United Kingdom facility closure | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5,629,000
Manchester, United Kingdom facility closure | Onerous Lease
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 3,167,000

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Restructuring Charges (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Manchester, United Kingdom facility closure
Restructuring Cost and Reserve [Line Items]
Total provision recognized				$ 8,796,000
Utilized	$ (149,000)	$ (1,359,000)	$ (1,167,000)
Asset write-off				(5,629,000)
Closing provision	492,000	641,000	2,000,000	3,167,000
Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Total provision recognized	0	8,159,000
Utilized	(768,000)	(6,305,000)
Foreign exchange		(63,000)
Closing provision	1,023,000	1,791,000
Workforce Reduction | Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Total provision recognized		6,190,000
Utilized	(393,000)	(5,734,000)
Foreign exchange		(63,000)
Closing provision		393,000
Onerous Lease | Manchester, United Kingdom facility closure
Restructuring Cost and Reserve [Line Items]
Total provision recognized				3,167,000
Utilized	(149,000)	(1,359,000)	(1,167,000)
Closing provision	492,000	641,000	$ 2,000,000	3,167,000
Onerous Lease | Resource Rationalizations
Restructuring Cost and Reserve [Line Items]
Total provision recognized		1,969,000
Utilized	(375,000)	(571,000)
Closing provision	$ 1,023,000	$ 1,398,000
Asset Impairment | Manchester, United Kingdom facility closure
Restructuring Cost and Reserve [Line Items]
Total provision recognized				5,629,000
Asset write-off				$ (5,629,000)

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Income Taxes Recognized During Period (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of Provision of Income Taxes [Line Items]
Provision for income taxes	$ 11,625	$ 10,165

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Liability for unrecognized tax benefit	$ 30.6	$ 29.9
Items generating unrecognized tax benefits	27.2	26.6
Interest and related penalties	$ 3.4	$ 3.3
Earliest Tax Year
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax year subject to examination by major tax jurisdictions	2012
Latest Tax Year
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax year subject to examination by major tax jurisdictions	2016

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Reconciliation of Number of Shares Used in Computation of Basic and Diluted Net Income Per Ordinary Share (Detail) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
Weighted average number of ordinary shares outstanding for basic net income per ordinary share	54,372,931	55,011,019
Effect of dilutive share options outstanding	998,895	1,231,145
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share	55,371,826	56,242,164

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Share-based Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		12 Months Ended	51 Months Ended
	Feb. 14, 2017	May 11, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Mar. 31, 2017
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Non-cash stock compensation expense not yet recognized			$ 63.2			$ 63.2
Unrecognized stock-based compensation expense, weighted average period (years)			2 years 2 months 12 days
Restricted Stock Units (RSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Fair value of stock units vested			$ 2.3		$ 10.8
Stock units granted			39,146
Performance Share Unit (PSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Fair value of stock units vested			$ 14.4		$ 10.3
Stock units granted			79,346
PSUs Based on Service and EPS Targets
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock units granted						307,351
PSUs Based on Service and EPS Targets | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Cumulative EPS vesting period			2014
PSUs Based on Service and EPS Targets | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock units to be granted			283,220			283,220
Cumulative EPS vesting period			2020
Employee Stock Plan, 2008 Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Ordinary shares which have been reserved for issuance			6,000,000			6,000,000
Employee Stock Plan, 2008 Plan | Individual Employee
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Ordinary shares which have been reserved for issuance			400,000			400,000
Employee Stock Plan, 2008 Plan | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Additional number of ordinary shares which have been reserved for issuance	400,000
Percentage of option price for fair value of ordinary share			100.00%
Employee Stock Plan, 2008 Plan | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Additional number of ordinary shares which have been reserved for issuance	1,000,000
Employee Stock Plan, 2003 Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Ordinary shares which have been reserved for issuance			6,000,000			6,000,000
Maximum number of award as percentage of shares outstanding			10.00%
Employee Stock Plan, 2003 Plan | Individual Employee
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Ordinary shares which have been reserved for issuance			400,000			400,000
Employee Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares vesting period			5 years
Shares expiration period			8 years
Weighted average contractual term of options outstanding			4 years 11 months 16 days
Weighted average fair value per option			$ 11.12
Exercisable - number of shares			682,269			682,269
Exercisable - weighted average remaining contractual life			3 years 9 months 15 days
Exercisable - weighted average exercise price			$ 36.53			$ 36.53
Fully vested total intrinsic value			$ 29.5			$ 29.5
Intrinsic value of option exercised			$ 7.4	$ 2.2
Employee Stock Option | Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Options outstanding fair value			$ 6.72			$ 6.72
Employee Stock Option | Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Weighted average contractual term of options outstanding			8 years
Options outstanding fair value			$ 24.49			$ 24.49
Restricted Stock Units 2008
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Ordinary shares which have been reserved for issuance			1,000,000			1,000,000
Restricted Stock Units 2013
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Additional number of ordinary shares which have been reserved for issuance		2,500,000
Ordinary shares which have been reserved for issuance		4,100,000

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Summary of Stock Option Activity (Detail) - Employee Stock Option - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Options Outstanding Number of Shares
Outstanding at beginning of period	1,466,444
Granted	135,243
Exercised	(121,210)
Forfeited	(10,347)
Outstanding at end of period	1,470,130
Exercisable at end of period	682,269
Weighted Average Exercise Price
Outstanding at beginning of period	$ 43.45
Granted	83.47
Exercised	22.75
Forfeited	41.44
Outstanding at end of period	48.86
Exercisable at end of period	36.53
Weighted Average Fair Value
Outstanding at beginning of period	13.94
Granted	24.49	$ 20.78
Exercised	8.71
Forfeited	13.42
Outstanding at end of period	15.35
Exercisable at end of period	$ 12.35
Weighted Average Remaining Contractual Life
Outstanding at end of period	4 years 11 months 16 days
Exercisable at end of period	3 years 9 months 15 days

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Summary of Movement in Non-Vested Share Options (Detail) - Employee Stock Option - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Options Outstanding Number of Shares
Beginning Balance	814,870
Granted	135,243
Vested	(152,865)
Forfeited	(9,387)
Ending Balance	787,861
Weighted Average Exercise Price
Beginning balance	$ 54.37
Granted	83.47
Vested	54.19
Forfeited	43.40
Ending balance	59.53
Weighted Average Fair Value
Beginning Balance	16.55
Granted	24.49	$ 20.78
Vested	16.55
Forfeited	13.86
Ending Balance	$ 17.94

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Schedule of Weighted Average Fair Values and Assumptions Used (Detail) - Employee Stock Option - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value	$ 24.49	$ 20.78
Assumptions:
Expected volatility	29.00%	30.00%
Dividend yield	0.00%	0.00%
Risk-free interest rate	2.05%	1.39%
Expected life	5 years	5 years

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Summary of RSU and PSU Activity (Detail) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Performance Share Unit (PSUs)
Outstanding Number of Shares
Outstanding at beginning of period	830,523
Granted	79,346
Shares vested	(308,144)
Forfeited	(11,154)
Outstanding at ending of period	590,571	830,523
Weighted Average Fair Value
Outstanding at beginning of period	$ 60.73
Granted	83.47
Shares vested	46.86
Forfeited	51.35
Outstanding at end of period	$ 70.39	$ 60.73
Weighted Average Remaining Contractual Life
Outstanding at end of period	1 year 7 months 2 days	1 year 1 month 10 days
Restricted Stock Units (RSUs)
Outstanding Number of Shares
Outstanding at beginning of period	1,025,484
Granted	39,146
Shares vested	(37,235)
Forfeited	(37,522)
Outstanding at ending of period	989,873	1,025,484
Weighted Average Fair Value
Outstanding at beginning of period	$ 58.64
Granted	83.47
Shares vested	61.80
Forfeited	55.53
Outstanding at end of period	$ 59.62	$ 58.64
Weighted Average Remaining Contractual Life
Outstanding at end of period	1 year 2 months 23 days	1 year 4 months 24 days

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Schedule of Non-cash Stock Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 8,809	$ 9,591
Direct costs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	4,854	5,285
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3,955	$ 4,306

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Share Capital - Additional Information (Detail) - USD ($)			3 Months Ended
	Mar. 31, 2017	Oct. 03, 2016	Mar. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Ordinary shares repurchased	2,650,916		1,221,729
Ordinary shares repurchased, value	$ 206,400,000		$ 96,400,000
Buyback Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 400,000,000
Buyback Program | Maximum
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized percentage		10.00%

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Business Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 Segment
Segment Reporting Information [Line Items]
Number of operating segments	1

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Distribution of Net Revenue by Geographical Area (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net Revenue		$ 431,954	$ 400,522
Ireland
Segment Reporting Information [Line Items]
Net Revenue	[1]	109,205	100,835
Rest Of Europe
Segment Reporting Information [Line Items]
Net Revenue		71,453	75,642
United States
Segment Reporting Information [Line Items]
Net Revenue		201,615	184,090
Rest of World
Segment Reporting Information [Line Items]
Net Revenue		$ 49,681	$ 39,955

[1] All sales shown for Ireland are export sales.

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Distribution Income from Operations, by Geographical Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Income from operations	$ 85,658	$ 76,010
Ireland
Segment Reporting Information [Line Items]
Income from operations	63,968	59,551
Rest Of Europe
Segment Reporting Information [Line Items]
Income from operations	3,699	3,444
United States
Segment Reporting Information [Line Items]
Income from operations	10,499	10,784
Rest of World
Segment Reporting Information [Line Items]
Income from operations	$ 7,492	$ 2,231

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Distribution of Property, Plant and Equipment, Net, by Geographical Area (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 148,644	$ 148,967
Ireland
Segment Reporting Information [Line Items]
Property, plant and equipment, net	105,836	105,684
Rest Of Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	5,949	6,231
United States
Segment Reporting Information [Line Items]
Property, plant and equipment, net	27,931	29,428
Rest of World
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 8,928	$ 7,624

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Distribution of Depreciation and Amortization by Geographical Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 14,448	$ 15,120
Ireland
Segment Reporting Information [Line Items]
Depreciation and amortization	5,972	5,904
Rest Of Europe
Segment Reporting Information [Line Items]
Depreciation and amortization	1,658	1,715
United States
Segment Reporting Information [Line Items]
Depreciation and amortization	5,948	6,649
Rest of World
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 870	$ 852

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Distribution of Total Assets by Geographical Area (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 1,855,215	$ 1,825,843
Ireland
Segment Reporting Information [Line Items]
Assets	803,421	766,120
Rest Of Europe
Segment Reporting Information [Line Items]
Assets	356,355	337,062
United States
Segment Reporting Information [Line Items]
Assets	628,012	651,160
Rest of World
Segment Reporting Information [Line Items]
Assets	$ 67,427	$ 71,501