Schedule I - Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Apr. 09, 2014	Jan. 31, 2015	Apr. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 19, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued				91,861,054	90,320,374
Treasury stock, shares				6,519,773	6,519,773
Repurchase of treasury stock, Shares					2,413,803	2,605,970
Shares repurchased payment settlement during period		$ 5,650,000			$ 50,650,000	$ 60,058,000
Stock repurchased during period, total cost					45,000,000	65,708,000
Treasury stock at cost				$ 154,871,000	$ 154,871,000	109,871,000
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
Common stock, shares issued	0
Repurchase of treasury stock, Shares			1,750,000
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
Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance				15,000,000
Parent Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued				91,861,054	90,320,374
Treasury stock, shares				6,519,773	6,519,773
Share Repurchase Program, authorized amount						$ 250,000,000
Repurchase of treasury stock, Shares				0	2,413,803	855,970
Stock repurchased during period under Share Repurchase Program, average price per share					$ 18.62	$ 17.50
Shares repurchased payment settlement during period		$ 5,650,000			$ 50,650,000	$ 60,058,000
Stock repurchased during period, total cost					45,000,000	15,000,000
Share Repurchase Program, remaining authorized repurchase amount				$ 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)
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
Common stock, shares issued	0
Treasury stock, shares			1,750,000
Restricted payments to the parent					$ 45,000,000	$ 65,708,000
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
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