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Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 106,053	$ 75,913	$ 270,803	$ 212,125
Net income attributable to unvested awarded performance stock	(2,716)	(1,852)	(6,185)	(5,181)
Net income attributable to common shares	$ 103,337	$ 74,061	$ 264,618	$ 206,944
Weighted average number of common shares outstanding - basic (in shares)	278,132	279,512	276,744	280,024
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares)	(7,124)	(6,820)	(6,321)	(6,840)
Weighted average number of common shares outstanding for basic earnings per common share (in shares)	271,008	272,692	270,423	273,184
Dilutive effect of stock options (in shares)	4,274	5,094	5,191	4,838
Weighted average number of shares outstanding - diluted (in shares)	275,282	277,786	275,614	278,022
Basic (in dollars per share)	$ 0.38	$ 0.27	$ 0.98	$ 0.76
Diluted (in dollars per share)	$ 0.38	$ 0.27	$ 0.96	$ 0.74

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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