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Accumulated Other Comprehensive Income ("AOCI") - Summary of Total Changes in AOCI by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 292,078  
Other comprehensive income (loss) before reclassifications:        
(Loss) Gain on foreign currency translation adjustment $ (5,504) $ 2,949 (6,022) $ (8,460)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 125 75 352 264
Other comprehensive (loss) gain, net of tax (5,379) 3,024 (5,670) (8,196)
Ending Balance 308,790   308,790  
Unrecognized Pension Benefit Cost [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,477) (5,482) (6,704) (5,671)
Other comprehensive income (loss) before reclassifications:        
(Loss) Gain on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 125 75 352 264
Other comprehensive (loss) gain, net of tax 125 75 352 264
Ending Balance (6,352) (5,407) (6,352) (5,407)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (48,365) (63,091) (47,847) (51,682)
Other comprehensive income (loss) before reclassifications:        
(Loss) Gain on foreign currency translation adjustment (5,504) 2,949 (6,022) (8,460)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 0 0 0 0
Other comprehensive (loss) gain, net of tax (5,504) 2,949 (6,022) (8,460)
Ending Balance (53,869) (60,142) (53,869) (60,142)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (54,842) (68,573) (54,551) (57,353)
Amounts reclassified from AOCI:        
Ending Balance $ (60,221) $ (65,549) $ (60,221) $ (65,549)