Schedule I - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Total current assets	$ 109,057	$ 142,204
Total assets	2,391,134	2,422,471
Current liabilities:
Dividends payable	430	172	$ 17,939
Other accrued expenses	11,143	20,149
Total current liabilities	229,314	221,085
Total liabilities	$ 1,887,014	$ 1,842,936
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value—authorized, 100,000,000 shares, no shares issued or outstanding at December 31, 2015 and 2014
Common stock, $0.01 par value—authorized, 1,000,000,000 shares; 90,320,374 and 90,191,100 shares issued at December 31, 2015 and 2014, respectively	$ 903	$ 902
Additional paid-in capital	624,765	655,471
Retained earnings	46,460	33,516
Treasury stock, at cost (6,519,773 and 4,105,970 shares at December 31, 2015 and 2014, respectively)	(154,871)	(109,871)
Total stockholders’ equity	504,120	579,535	648,027	$ 442,301
Total liabilities and stockholders’ equity	2,391,134	2,422,471
Parent Company [Member]
Current assets:
Cash	430	5,858
Total current assets	430	5,858
Investment in wholly owned subsidiary	517,257	580,018
Total assets	517,687	585,876
Current liabilities:
Dividends payable	430	172	$ 17,939
Other accrued expenses		5,686
Total current liabilities	430	5,858
Total liabilities	$ 430	$ 5,858
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value—authorized, 100,000,000 shares, no shares issued or outstanding at December 31, 2015 and 2014
Common stock, $0.01 par value—authorized, 1,000,000,000 shares; 90,320,374 and 90,191,100 shares issued at December 31, 2015 and 2014, respectively	$ 903	$ 902
Additional paid-in capital	624,765	655,471
Retained earnings	46,460	33,516
Treasury stock, at cost (6,519,773 and 4,105,970 shares at December 31, 2015 and 2014, respectively)	(154,871)	(109,871)
Total stockholders’ equity	517,257	580,018
Total liabilities and stockholders’ equity	$ 517,687	$ 585,876