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Net Income Per Share - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
shares
Aug. 03, 2018
Dec. 31, 2017
$ / shares
Nov. 02, 2016
USD ($)
Jun. 30, 2015
USD ($)
May 01, 2013
$ / shares
Schedule Of Earnings Per Share [Line Items]              
Warrants Repurchased Average Cost per Warrant | $ / shares $ 8.21            
RemainingWarrantBuyBackAuthorizedDollars | $ $ 11,939            
AMPS Exchange Total Warrants Issued     824,307        
Successor [Member]              
Schedule Of Earnings Per Share [Line Items]              
Common stock, shares outstanding 45,332,214            
Par value of common stock issued | $ / shares $ 0.01     $ 0.01      
Exercise price of common stock | $ / shares             $ 16.67
Common stock shares issued 194 0          
First Warrant Buyback Authorization Dollars | $           $ 10,000  
Warrant exercised 194 0          
Warrants outstanding 4,877,783            
SecondWarrantBuyBackAuthorizedDollars | $         $ 10,000    
Warrants Purchased Shares 985,331            
Payments for Repurchase of Warrants | $ $ 8,092