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Net Income Per Share - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended 18 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Aug. 03, 2018
$ / shares
Nov. 02, 2016
USD ($)
Jun. 30, 2015
USD ($)
May 01, 2013
$ / shares
Apr. 30, 2013
$ / shares
Schedule Of Earnings Per Share [Line Items]                  
Common Stock, Shares, Outstanding 45,336,278                
Class of Warrant or Right, Outstanding 4,877,783                
Par value of common stock issued | $ / shares $ 0.01 $ 0.01             $ 0.01
Exercise price of common stock | $ / shares               $ 16.67  
Warrant exercised 194 0 136            
Stock Issued During Period, Shares, New Issues 194 0 136            
First Warrant Buyback Authorization Dollars | $             $ 10,000    
Payments for Repurchase of Warrants | $     $ 2,717 $ 8,092          
Warrants Repurchased Average Cost per Warrant | $ / shares       $ 8.21          
SecondWarrantBuyBackAuthorizedDollars | $           $ 10,000      
Warrants Purchased Shares       985,331          
RemainingWarrantBuyBackAuthorizedDollars | $ $ 11,939                
AMPS Exchange Total Warrants Issued         824,307        
AMPS Exchange Total Warrants Issued Cost Per Share | $ / shares         $ 9.72