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Income Tax - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]          
Tax Act adjustments $ (1,750) $ (25,992) $ 0    
Deferred income taxes         $ 46,879
Loss and credit carryforwards       $ 17,999 0
Uncertain tax position 0 0   $ 1,929 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Balance at beginning of year 0        
Increases for tax positions related to prior years 1,929        
Balance at end of year 1,929 0      
Income taxes, net of refunds $ 6,800 $ 36,000 $ 30,200    
Adjustments | Accounting Standards Update 2014-09          
Operating Loss Carryforwards [Line Items]          
Deferred income taxes         $ 7,965