Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income before income taxes	$ 167,368	$ 156,912	[1]
Provision for income taxes	43,675	45,822	[1]
Net income	$ 123,693	$ 111,090	[1]
Earnings per share:
Basic earnings per share (in dollars per share)	$ 1.34	$ 1.20	[1]
Diluted earnings per share (in dollars per share)	$ 1.31	$ 1.17	[1]
Weighted average common shares outstanding:
Basic weighted average shares outstanding (in shares)	92,108	92,516	[1]
Diluted weighted average shares outstanding (in shares)	94,560	95,030	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities	$ 54,215	$ 122,623
Net cash used in investing activities	(21,123)	(20,745)
Net cash provided by (used in) financing activities	19,094	(158,507)
Effect of foreign currency exchange rates on cash	19,356	8,795
Net increase (decrease) in cash and cash equivalents	71,542	(47,834)
Foreign exchange gain (loss) recognized	(1,500)	(700)
Reclassification from other comprehensive income (loss), foreign currency transaction	$ 36,000	19,000
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income before income taxes		156,912
Provision for income taxes		46,940
Net income		$ 109,972
Earnings per share:
Basic earnings per share (in dollars per share)		$ 1.19
Diluted earnings per share (in dollars per share)		$ 1.17
Weighted average common shares outstanding:
Basic weighted average shares outstanding (in shares)		92,516
Diluted weighted average shares outstanding (in shares)		94,329
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities		$ 121,505
Net cash used in investing activities		(20,745)
Net cash provided by (used in) financing activities		(157,389)
Effect of foreign currency exchange rates on cash		8,795
Net increase (decrease) in cash and cash equivalents		(47,834)
Accounting Standards Update 2016-09 | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income before income taxes		0
Provision for income taxes		(1,118)
Net income		$ 1,118
Earnings per share:
Basic earnings per share (in dollars per share)		$ 0.01
Diluted earnings per share (in dollars per share)		$ 0.00
Weighted average common shares outstanding:
Basic weighted average shares outstanding (in shares)		0
Diluted weighted average shares outstanding (in shares)		701
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities		$ 1,118
Net cash used in investing activities		0
Net cash provided by (used in) financing activities		(1,118)
Effect of foreign currency exchange rates on cash		0
Net increase (decrease) in cash and cash equivalents		$ 0

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based compensation, including the income tax consequences.