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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($)	12 Months Ended			76 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Feb. 28, 2018
Stock authorized to purchase under stock repurchase program					$ 200,000,000
Repurchase of common stock, shares	2,346,427	1,653,573	3,020,926	44,129,393
Repurchase of common stock, value	$ 54,527,000	$ 37,387,000	$ 60,089,000	$ 547,800,000
Number shares issued pursuant to stock option exercises	1,379,704
Stock Options [Member]
Number shares issued pursuant to stock option exercises	1,379,704	1,204,559	797,140
Restricted Share Awards (RSAs) [Member]
Stock issued during the period restricted share awards		560,174	148,322
Retention RSAs [Member]
Stock issued during the period restricted share awards			470,029
Restricted Share Units [Member]
Stock issued during the period restricted share awards	10,000
Maximum [Member]
Remaining value of shares authorized for purchase under the stock repurchase program	$ 176,600,000	$ 176,600,000		$ 176,600,000

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