Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
	Apr. 01, 2016	Apr. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Stockholders Equity [Line Items]
Common stock, shares issued			90,375,377		90,320,374
Unvested shares of common stock			4,888,395
Treasury stock, shares			6,519,773		6,519,773
Dividends paid to stockholders			$ 17,674,000	$ 18,098,000
Dividends payable			21,807,000	$ 18,373,000	$ 430,000
Share Repurchase Program, authorized amount						$ 250,000,000
Share Repurchase Program, remaining authorized repurchase amount			$ 190,000,000
Stock Repurchase Program, number of shares authorized to be repurchased			0
Treasury stock at cost			$ 154,871,000		$ 154,871,000
2.25x Performance Restricted Shares [Member]
Stockholders Equity [Line Items]
Unvested shares of common stock			1,370,821		1,370,821
Accumulated dividends on unvested performance restricted shares			$ 3,400,000
2.75x Performance Restricted Shares [Member]
Stockholders Equity [Line Items]
Unvested shares of common stock			1,370,821		1,370,821
Accumulated dividends on unvested performance restricted shares			$ 3,400,000
Bonus Performance Restricted Shares [Member]
Stockholders Equity [Line Items]
Unvested shares of common stock			463,740		415,995
Accumulated dividends on unvested performance restricted shares			$ 97,000
Long-Term Incentive Performance Restricted Shares [Member]
Stockholders Equity [Line Items]
Unvested shares of common stock			238,272		62,365
Accumulated dividends on unvested performance restricted shares			$ 99,000
Dividends on shares probable of vesting			$ 34,000
Subsequent Events [Member]
Stockholders Equity [Line Items]
Dividends paid		$ 21,000,000
Subsequent Events [Member] | 2.25x Performance Restricted Shares [Member] | Omnibus Incentive Plan and Pre-IPO incentive plan [Member]
Stockholders Equity [Line Items]
Accumulated dividends on vested performance restricted shares	$ 3,400,000