Schedule I - Stockholders' Equity - Additional Information (Detail)					1 Months Ended				12 Months Ended
	Apr. 09, 2014 shares	Dec. 17, 2013 shares	Apr. 24, 2013 USD ($) $ / shares shares	Apr. 08, 2013	Dec. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2015 USD ($)	Apr. 30, 2014 shares	Dec. 31, 2013 shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	Aug. 12, 2014 USD ($)	Apr. 19, 2013 shares	Apr. 18, 2013 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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					1,000,000,000				1,000,000,000	1,000,000,000
Preferred stock, shares authorized					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
Common stock, shares issued					90,320,374				90,320,374	90,191,100
Treasury stock, shares					6,519,773				6,519,773	4,105,970
Share Repurchase Program, authorized amount | $												$ 250,000,000
Repurchase of treasury stock, Shares									2,413,803	2,605,970	1,500,000
Stock repurchased during period under Share Repurchase Program, average price per share | $ / shares									$ 18.62	$ 17.50
Repurchase of common stock | $					$ 30,000,000	$ 5,650,000			$ 50,650,000	$ 60,058,000	$ 44,163,000
Stock repurchased during period, total cost | $									45,000,000	65,708,000	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
Initial Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock in initial public offering, net of underwriter commissions and offering costs, shares			10,000,000
Shares offered and sold by the selling stockholders			19,900,000
Offering price per share | $ / shares			$ 27.00											$ 27.00
Net proceeds received from offering | $			$ 245,400,000
Underwriters Over-Allotment Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares offered and sold by the selling stockholders	2,250,000		3,900,000
Secondary Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares offered and sold by the selling stockholders	17,250,000	18,000,000
Common stock, shares issued	0	0
Repurchase of treasury stock, Shares							1,750,000	1,500,000
Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance					15,000,000				15,000,000
Parent Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split description									On April 7, 2013, the Parent’s Board authorized an eight-for-one split of the Parent’s common stock which was effective on April 8, 2013. The Parent 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 condensed balance sheet reflects the stock split.
Stock split conversion ratio				8
Common stock, par value | $ / shares					$ 0.01				$ 0.01	$ 0.01
Common stock, shares authorized					1,000,000,000				1,000,000,000	1,000,000,000
Preferred stock, shares authorized					100,000,000				100,000,000	100,000,000
Preferred stock, par value | $ / shares					$ 0.01				$ 0.01	$ 0.01
Common stock, shares issued					90,320,374				90,320,374	90,191,100
Treasury stock, shares					6,519,773				6,519,773	4,105,970
Share Repurchase Program, authorized amount | $												$ 250,000,000
Repurchase of treasury stock, Shares									2,413,803	855,970
Stock repurchased during period under Share Repurchase Program, average price per share | $ / shares									$ 18.62	$ 17.50
Repurchase of common stock | $						$ 5,650,000			$ 50,650,000	$ 60,058,000	44,163,000
Stock repurchased during period, total cost | $									45,000,000	15,000,000
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
Restricted payments to the parent | $									(45,000,000)	(65,708,000)	$ (44,163,000)
Parent Company [Member] | Initial Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock in initial public offering, net of underwriter commissions and offering costs, shares			10,000,000
Shares offered and sold by the selling stockholders			19,900,000
Offering price per share | $ / shares			$ 27.00
Net proceeds received from offering | $			$ 245,400
Parent Company [Member] | Underwriters Over-Allotment Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares offered and sold by the selling stockholders	2,250,000		3,900,000
Parent Company [Member] | Secondary Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares offered and sold by the selling stockholders	17,250,000	18,000,000
Common stock, shares issued	0	0
Treasury stock, shares							1,750,000	1,500,000			1,500,000
Restricted payments to the parent | $									$ 45,000,000	$ 65,708,000	$ 44,163,000
Parent Company [Member] | Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance													15,000,000