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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 292,078  
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment $ 4,311 $ 5,472 (518) $ (11,409)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 113 91 227 189
Net current period other comprehensive income (loss) 4,424 5,563 (291) (11,220)
Ending Balance 303,632   303,632  
Unrecognized Pension Benefit Cost [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,590) (5,573) (6,704) (5,671)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 113 91 227 189
Net current period other comprehensive income (loss) 113 91 227 189
Ending Balance (6,477) (5,482) (6,477) (5,482)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (52,676) (68,563) (47,847) (51,682)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 4,311 5,472 (518) (11,409)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 0 0 0 0
Net current period other comprehensive income (loss) 4,311 5,472 (518) (11,409)
Ending Balance (48,365) (63,091) (48,365) (63,091)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (59,266) (74,136) (54,551) (57,353)
Amounts reclassified from AOCI:        
Ending Balance $ (54,842) $ (68,573) $ (54,842) $ (68,573)