Schedule I - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Total current assets	$ 146,567	$ 118,775
Total assets	2,115,602	2,085,782
Current liabilities:
Dividends payable	84	470
Other accrued liabilities	23,066	20,082
Total current liabilities	310,671	253,470
Total liabilities	1,850,408	1,798,316
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value—authorized, 100,000,000 shares, no shares issued or outstanding at December 31, 2018 and 2017
Common stock, $0.01 par value—authorized, 1,000,000,000 shares; 93,400,929 and 92,637,403 shares issued at December 31, 2018 and 2017, respectively	934	926
Additional paid-in capital	663,834	641,324
Accumulated other comprehensive gain (loss)	2,284	(5,076)
Accumulated deficit	(148,955)	(194,837)
Treasury stock, at cost (10,174,589 and 6,519,773 shares at December 31, 2018 and 2017, respectively)	(252,903)	(154,871)
Total stockholders’ equity	265,194	287,466	$ 461,215	$ 504,120
Total liabilities and stockholders’ equity	2,115,602	2,085,782
Parent Company [Member]
Current assets:
Cash	136	470
Total current assets	136	470
Investment in wholly owned subsidiary	265,194	287,466
Total assets	265,330	287,936
Current liabilities:
Dividends payable	84	470
Other accrued liabilities	52
Total current liabilities	136	470
Total liabilities	136	470
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value—authorized, 100,000,000 shares, no shares issued or outstanding at December 31, 2018 and 2017
Common stock, $0.01 par value—authorized, 1,000,000,000 shares; 93,400,929 and 92,637,403 shares issued at December 31, 2018 and 2017, respectively	934	926
Additional paid-in capital	663,834	641,324
Accumulated other comprehensive gain (loss)	2,284	(5,076)
Accumulated deficit	(148,955)	(194,837)
Treasury stock, at cost (10,174,589 and 6,519,773 shares at December 31, 2018 and 2017, respectively)	(252,903)	(154,871)
Total stockholders’ equity	265,194	287,466
Total liabilities and stockholders’ equity	$ 265,330	$ 287,936