Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	4 Months Ended	12 Months Ended			30 Months Ended
	Apr. 30, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Nov. 02, 2016	Jun. 30, 2015	May 01, 2013
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued	45,000,000
Par value of common stock issued	$ 0.01
Exercise price of common stock	$ 16.67
Investment Warrants Expiration Date	Apr. 30, 2023
Warrants Repurchased Average Cost per Warrant					$ 8.21
RemainingWarrantBuyBackAuthorizedDollars		$ 11,939			$ 11,939
Successor [Member]
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued								45,000,000
Par value of common stock issued		$ 0.01	$ 0.01		$ 0.01			$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	5,047,138							5,047,138
Exercise price of common stock								$ 16.67
Warrant exercised		0	136	740
Stock Issued During Period, Shares, New Issues		0	136	236
First Warrant Buyback Authorization Dollars							$ 10,000
Warrants outstanding		4,053,670			4,053,670
Warrants Purchased During Period Shares					985,331
Payments for Repurchase of Warrants		$ 0	$ 2,717	$ 5,375	$ 8,092
SecondWarrantBuyBackAuthorizedDollars						$ 10,000
Warrants Purchased During Period Shares		0
Warrants Purchased During Period Dollars		$ 0