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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Income available to common stockholders									$ 269,911	$ 187,191	$ 195,171
Denominator:
Basic weighted-average shares outstanding (shares)									148,183,431	154,134,411	160,859,782
Effect of dilutive shares:
Stock options and unvested restricted stock units (shares)									821,259	950,955	521,717
Diluted weighted-average shares outstanding (shares)									149,004,690	155,085,366	161,381,499
Basic
Basic (in dollars per share)	$ 0.70	$ 0.43	$ 0.42	$ 0.28	$ 0.49	$ 0.48	$ 0.21	$ 0.05	$ 1.82	$ 1.21	$ 1.21
Diluted
Diluted (in dollars per share)	$ 0.70	$ 0.43	$ 0.42	$ 0.28	$ 0.49	$ 0.48	$ 0.21	$ 0.05	$ 1.81	$ 1.21	$ 1.21
Antidilutive stock options not included in diluted earnings per share (in shares)									1,645,816	3,288,340	4,551,337

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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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Amount after tax of income (loss) from continuing operations attributable to the parent.

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