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Beginning Balance, Annual Activity and Ending Balance of Foreign Currency Translation Adjustment Included as Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 344,156 $ 329,230 $ 305,314
Foreign currency translation adjustment (3,624) (1,191)  
Balance 360,736 344,156 329,230
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (5,698) (4,507) (4,507)
Foreign currency translation adjustment (3,624) (1,191)
Balance $ (9,322) $ (5,698) $ (4,507)