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Employee Benefit Plans - Summary of Changes in Projected Benefit Obligations and Plan Assets, and Ending Balances of Defined Benefit Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in projected benefit obligations:    
Service cost $ 828 $ 657
Interest cost 471 433
Change in plan assets:    
Fair value of plan assets, beginning of year 7,822  
Fair value of plan assets, end of year 11,093 7,822
Newport [Member]    
Change in projected benefit obligations:    
Projected benefit obligations, beginning of year 24,885 25,736
Assumed from ESI Merger 3,522  
Service cost 828 657
Interest cost 471 433
Actuarial loss (gain) 2,057 (98)
Benefits paid (1,469) (895)
Currency translation adjustments (242) (948)
Projected benefit obligations, end of year 30,052 24,885
Change in plan assets:    
Fair value of plan assets, beginning of year 7,822 8,152
Assumed from ESI Merger 1,272  
Company contributions 1,846 324
Gain (loss) on plan assets 591 (56)
Benefits paid (569) (369)
Currency translation adjustments 131 (229)
Fair value of plan assets, end of year 11,093 7,822
Net underfunded status $ (18,959) $ (17,063)