Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.19.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Change in valuation allowance (excluding impact of Tax Act) $ 28,353 $ 30,704 $ 117,707
Liability for unrecognized tax benefits 5,728 5,395  
Accrued interest and penalties related to uncertain tax positions 2,100 2,100  
Unrecognized tax benefits, interest on tax expense (100)    
Unrecognized tax benefits, tax penalties 100    
Deferred tax valuation allowance      
Income Tax Contingency [Line Items]      
Charged to cost and expenses $ (28,353) $ 14,625 $ (117,707)