Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018			2017
Deferred tax assets
Allowance for doubtful accounts	$	11,792		$	11,279
Accrued vacation and bonus	23,545			23,896
Deferred rent	9,016			8,491
Share-based compensation	11,837			15,108
Notes receivable from employees	12,993			12,879
State net operating loss carryforward	3,510			3,586
Foreign net operating loss carryforward	9,857			12,075
Federal tax credit and capital loss carryforward	9,470			7,403
Deferred compensation	1,801			2,688
Other, net	1,129			7,159
Total deferred tax assets	94,950			104,564
Deferred tax liabilities
Revenue recognition	(5,087		)	(7,227		)
Property, equipment and capitalized software	(6,652		)	(2,308		)
Equity debt discount	(11,014		)	—
Goodwill and other intangible asset amortization	(199,964		)	(190,638		)
Total deferred tax liabilities	(222,717		)	(200,173		)
Foreign withholding tax	(413		)	(1,035		)
Valuation allowance	(21,929		)	(21,621		)
Net deferred tax liabilities	$	(150,109	)	$	(118,265	)

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

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

	Year Ended December 31,
	2018		2017		2016
Domestic	$	96,543	$	30,013	$	66,202
Foreign	111,249		57,092		61,601
Total	$	207,792	$	87,105	$	127,803

Summary of Components of Income Tax Provision from Continuing Operations

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

	Year Ended December 31,
	2018		2017			2016
Current
Federal	$	10,847	$	15,164		$	(3,326	)
State	4,447		742			1,686
Foreign	21,056		14,816			13,864
	36,350		30,722			12,224
Deferred
Federal	14,538		(47,820		)	23,182
State	503		(152		)	8,284
Foreign	5,790		(3,607		)	(1,407		)
	20,831		(51,579		)	30,059
Income tax provision (benefit)	$	57,181	$	(20,857	)	$	42,283

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,
	2018			2017			2016
Income tax expense at federal statutory rate	$	43,636		$	30,487		$	44,731
State income taxes, net of federal benefit	4,950			781			6,075
Detriment (benefit) from lower foreign tax rates	3,655			(8,500		)	(7,827		)
Valuation allowance on foreign net operating loss carryforward	(450		)	253			254
Other expenses not deductible for tax purposes	3,543			2,466			3,082
Adjustment to reserve for uncertain tax positions	(132		)	456			(3,547		)
Impact of 2017 U.S. tax reform — deferred tax	(706		)	(63,525		)	—
Impact of 2017 U.S. tax reform — Transition Tax	50			18,655			—
Sale of Ringtail business	3,798			—			—
Other adjustments, net	(1,163		)	(1,930		)	(485		)
Income tax provision (benefit)	$	57,181		$	(20,857	)	$	42,283