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Earnings Per Share - Earnings Per Share Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income per basic common share, Net Income (Numerator)	$ 200,669	$ 138,133	$ 144,410	$ 108,986	$ 185,152	$ 141,014	$ 155,677	$ 111,951	$ 592,198	$ 593,794	$ 20,311
Net income per diluted common share, Net Income (Numerator)									$ 592,198	$ 593,794	$ 20,311
Net income per basic common share, Weighted-Average Shares (Denominator)	63,795	66,226	68,989	71,704	74,802	76,575	77,833	78,883	67,627	76,992	79,793
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities, Weighted-Average Shares (Denominator)									539	626	811
Net income per diluted common share, Weighted-Average Shares (Denominator)	64,348	66,768	69,494	72,415	75,345	77,136	78,438	79,715	68,166	77,618	80,604
Net income per basic common share, Per Share Amount	$ 3.15	$ 2.09	$ 2.09	$ 1.52	$ 2.48	$ 1.84	$ 2.00	$ 1.42	$ 8.76	$ 7.71	$ 0.25
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities, Per Share Amount									(0.07)	(0.06)
Net income per diluted common share, Per Share Amount	$ 3.12	$ 2.07	$ 2.08	$ 1.51	$ 2.46	$ 1.83	$ 1.98	$ 1.40	$ 8.69	$ 7.65	$ 0.25

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