Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Summary of Components of Deferred Tax Assets and Liabilities

The table below summarizes significant components of deferred tax assets and liabilities.

	Year Ended December 31,
	2017			2016
Deferred tax assets
Allowance for doubtful accounts	$	11,279		$	17,220
Accrued vacation and bonus	23,896			38,596
Deferred rent	8,491			12,034
Share-based compensation	15,108			24,783
Notes receivable from employees	12,879			21,010
State net operating loss carryforward and credits	3,586			4,169
Foreign net operating loss carryforward	12,075			12,437
Future foreign tax credit asset and foreign tax credit carryforward	7,403			2,545
Deferred compensation	2,688			3,084
Other, net	7,159			5,284
Total deferred tax assets	104,564			141,162
Deferred tax liabilities
Revenue recognition	(7,227		)	(11,590		)
Property, equipment and capitalized software	(2,308		)	(6,527		)
Goodwill and other intangible asset amortization	(190,638		)	(273,990		)
Total deferred tax liabilities	(200,173		)	(292,107		)
Foreign withholding tax	(1,035		)	—
Valuation allowance	(21,621		)	(18,900		)
Net deferred tax liabilities	$	(118,265	)	$	(169,845	)

Summary of Components of Income Before Income Tax Provision from Continuing Operations

The table below summarizes the components of income before income tax provision from continuing operations.

	Year Ended December 31,
	2017		2016		2015
Domestic	$	30,013	$	66,202	$	59,408
Foreign	57,092		61,601		45,978
Total	$	87,105	$	127,803	$	105,386

Summary of Components of Income Tax Provision from Continuing Operations

The table below summarizes the components of income tax provision from continuing operations.

	Year Ended December 31,
	2017			2016			2015
Current
Federal	$	15,164		$	(3,326	)	$	23,957
State	742			1,686			1,943
Foreign	14,816			13,864			10,029
	30,722			12,224			35,929
Deferred
Federal	(47,820		)	23,182			1,546
State	(152		)	8,284			1,265
Foreign	(3,607		)	(1,407		)	593
	(51,579		)	30,059			3,404
Income tax provision	$	(20,857	)	$	42,283		$	39,333

Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates

Our income tax provision (benefit) from continuing operations resulted in effective tax rates that varied from the statutory federal income tax rate as summarized below.

	Year Ended December 31,
	2017			2016			2015
Income tax expense at federal statutory rate	$	30,487		$	44,731		$	36,885
State income taxes, net of federal benefit	781			6,075			1,587
Benefit from lower foreign tax rates	(8,500		)	(7,827		)	(5,973		)
Valuation allowance on foreign tax credits and    net operating loss carryforward	253			254			2,326
Other expenses not deductible for tax purposes	2,466			3,082			2,719
Adjustment to reserve for uncertain tax positions	456			(3,547		)	658
Impact of 2017 U.S. tax reform — deferred tax	(63,525		)	—			—
Impact of 2017 U.S. tax reform — transition tax	18,655			—			—
Other adjustments, net	(1,930		)	(485		)	1,131
Income tax provision (benefit)	$	(20,857	)	$	42,283		$	39,333