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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 1,304,441
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax					$ 609
Net income	$ 162,102	$ 117,392	412,902	$ 274,371
Purchase of common stock for treasury			(230,199)
Equity-based compensation			32,678
Proceeds from stock options exercised			130,245
Ending Balance	1,650,676		1,650,676
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			206
Ending Balance	206		206
Additional Paid-In-Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			1,515,828
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax					1,566
Equity-based compensation			32,678
Proceeds from stock options exercised			130,245
Treasury stock issued upon option exercise and restricted share vesting			(54,205)
Ending Balance	1,626,112		1,626,112
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			5,695,376
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax					$ (957)
Net income			412,902
Ending Balance	6,107,321		6,107,321
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(5,906,969)
Purchase of common stock for treasury			(230,199)
Treasury stock issued upon option exercise and restricted share vesting			54,205
Ending Balance	(6,082,963)		(6,082,963)
Deferred Compensation Trust [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(17,375)
Deferred compensation activity			(1)
Ending Balance	(17,376)		(17,376)
Deferred Compensation Liability [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			17,375
Deferred compensation activity			1
Ending Balance	$ 17,376		$ 17,376

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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