Common Stock and Share-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)			1,000,000		1,000,000
Common stock, shares authorized (in shares)			250,000,000		250,000,000
Common stock, par value (in dollars per share)			$ 0.01		$ 0.01		$ 0.01
Dividends paid (in dollars per share)	$ 0.09	$ 0.09
Cash dividends paid					$ 16,357,000	$ 16,514,000
Quarterly dividends expected (in dollars per share)					$ 0.09
Annual dividends expected (in dollars per share)					$ 0.36
Repurchase of common stock				$ 25,000,000	$ 0	$ 25,000,000
Unrecognized stock option expense related to unvested awards			$ 0		0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount for common share repurchase threshold			$ 2,380,000,000.00		$ 2,380,000,000.00
Repurchase of common stock (in shares)			0	1,371,185	0	1,371,185
Remaining authorized amount for common share repurchase			$ 197,100,000		$ 197,100,000