Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Income Tax Expense (Benefit) (Detail)

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Income Taxes - Summary of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 80 $ (1,921) $ 2,485
State 54 (9) 365
Foreign 9,130 7,038 16,754
Deferred:      
Federal 167 64,066 (141)
State 0 (47) (4,769)
Foreign (391) 5,043 7,619
Total income tax expense (benefit) $ 9,040 $ 74,170 $ 22,313