Stockholders' Equity - Additional Information (Detail)																			1 Months Ended				3 Months Ended	12 Months Ended
	Feb. 22, 2016 $ / shares	Jan. 22, 2016 USD ($)	Jan. 05, 2016 $ / shares	Oct. 06, 2015 USD ($)	Sep. 16, 2015 $ / shares	Jul. 01, 2015 USD ($)	Jun. 10, 2015 $ / shares	Apr. 01, 2015 USD ($)	Mar. 03, 2015 $ / shares	Jan. 22, 2015 USD ($)	Jan. 05, 2015 $ / shares	Apr. 09, 2014 shares	Jan. 03, 2014 USD ($)	Dec. 17, 2013 shares	Oct. 01, 2013 USD ($)	Jul. 01, 2013 USD ($)	Apr. 24, 2013 USD ($) $ / shares shares	Apr. 08, 2013	Dec. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2015 USD ($)	Apr. 30, 2014 shares	Dec. 31, 2013 USD ($) shares	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Aug. 12, 2014 USD ($)	Apr. 18, 2013 $ / shares
Stockholders Equity [Line Items]
Common stock, shares issued | shares																			90,320,374					90,320,374	90,191,100
Unvested shares of common stock | shares																			4,228,032					4,228,032
Treasury stock, shares | shares																			6,519,773					6,519,773	4,105,970
Cash dividends declared per share | $ / shares					$ 0.21		$ 0.21		$ 0.21		$ 0.21													$ 0.84	$ 0.62	$ 0.60
Cash dividends record date					Sep. 29, 2015		Jun. 22, 2015		Mar. 13, 2015		Jan. 13, 2015
Cash dividends payable date					Oct. 06, 2015		Jul. 01, 2015		Apr. 01, 2015		Jan. 22, 2015
Dividends payable																			$ 430,000			$ 17,939,000		$ 430,000	$ 172,000	$ 17,939,000
Dividends paid to stockholders																								$ 72,318,000	$ 72,113,000	36,175,000
Stock split description																								On April 7, 2013, the Board authorized an eight-for-one split of the Company’s common stock, which was effective on April 8, 2013. The Company retained the current par value of $0.01 per share for all shares of common stock after the stock split, and accordingly, stockholders’ equity on the accompanying consolidated balance sheets and the consolidated statements of changes in stockholders’ equity reflects the stock split. The Company’s historical share and per share information has been retroactively adjusted to give effect to this stock split.
Stock split conversion ratio																		8
Common stock, par value | $ / shares																			$ 0.01					$ 0.01	$ 0.01
Common stock, shares authorized | shares																			1,000,000,000					1,000,000,000	1,000,000,000
Preferred stock, shares authorized | shares																			100,000,000					100,000,000	100,000,000
Preferred stock, par value | $ / shares																			$ 0.01					$ 0.01	$ 0.01
Net proceeds received from offering																										245,441,000
Secondary offering costs																								$ 0	$ 747,000	$ 1,407,000
Shares repurchased | shares																								2,413,803	2,605,970	1,500,000
Share Repurchase Program, authorized amount																											$ 250,000,000
Stock repurchased during period under Share Repurchase Program, average price per share | $ / shares																								$ 18.62	$ 17.50
Stock repurchased during period, total cost																								$ 45,000,000	$ 65,708,000	$ 44,163,000
Repurchase of common stock																			$ 30,000,000	$ 5,650,000				50,650,000	60,058,000	$ 44,163,000
Share Repurchase Program, remaining authorized repurchase amount																			190,000,000					190,000,000
Treasury stock at cost																			154,871,000					154,871,000	$ 109,871,000
Share Repurchase Program [Member]
Stockholders Equity [Line Items]
Shares repurchased | shares																									855,970
Stock repurchased during period, total cost																									$ 15,000,000
Blackstone and Affiliates [Member]
Stockholders Equity [Line Items]
Dividends paid to stockholders				$ 4,095,000		$ 4,095,000		$ 4,095,000		$ 4,095,000			$ 7,849,000		$ 11,749,000	$ 11,749,000
Termination fee paid																	$ 46,300,000		$ 0					$ 0	$ 0
Senior Notes [Member] | On or After December 1, 2014 [Member]
Stockholders Equity [Line Items]
Redemption price for Senior Notes Percentage																	111.00%
Initial Public Offering [Member]
Stockholders Equity [Line Items]
Shares of common stock issued through initial public offering, shares | shares																	10,000,000
Shares offered and sold by the selling stockholders | shares																	19,900,000
Offering price per share | $ / shares																	$ 27.00											$ 27.00
Net proceeds received from offering																	$ 245,400,000
Initial Public Offering [Member] | Blackstone and Affiliates [Member]
Stockholders Equity [Line Items]
Termination fee paid																	46,300,000
Initial Public Offering [Member] | Senior Notes [Member]
Stockholders Equity [Line Items]
Net proceeds received used to redeem 11% Senior Notes																	140,000,000
Initial Public Offering [Member] | Term B Loan [Member]
Stockholders Equity [Line Items]
Net proceeds from offering																	$ 37,000,000
Underwriters Over-Allotment Option [Member]
Stockholders Equity [Line Items]
Shares offered and sold by the selling stockholders | shares												2,250,000					3,900,000
Secondary Offering [Member]
Stockholders Equity [Line Items]
Common stock, shares issued | shares												0		0
Shares offered and sold by the selling stockholders | shares												17,250,000		18,000,000
Shares repurchased | shares																					1,750,000	1,500,000
2.25x Performance Restricted Shares [Member]
Stockholders Equity [Line Items]
Unvested shares of common stock | shares																			1,370,821					1,370,821	1,451,453
Dividends payable on unvested restricted performance shares not probable of vesting																								$ 2,820,000
2.25x Performance Restricted Shares [Member] | Scenario, Forecast [Member]
Stockholders Equity [Line Items]
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 | shares																			1,370,821					1,370,821	1,451,453
Dividends payable on unvested restricted performance shares not probable of vesting																								$ 2,820,000
Subsequent Events [Member]
Stockholders Equity [Line Items]
Cash dividends declared per share | $ / shares	$ 0.21		$ 0.21
Cash dividends declared date	Feb. 22, 2016		Jan. 05, 2016
Cash dividends record date	Mar. 14, 2016		Jan. 15, 2016
Cash dividends payable date	Apr. 01, 2016		Jan. 22, 2016
Subsequent Events [Member] | Blackstone and Affiliates [Member]
Stockholders Equity [Line Items]
Dividends paid to stockholders		$ 4,095,000