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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 268,535  
Other comprehensive loss before reclassifications:        
(Loss) gain on foreign currency translation adjustment $ 5,472 $ 1,100 (11,409) $ 2,453
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 91 93 189 186
Other comprehensive income (loss), net of tax 5,563 1,193 (11,220) 2,639
Ending Balance 264,161   264,161  
Unrecognized Pension Benefit Cost [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (5,573) (5,780) (5,671) (5,873)
Other comprehensive 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 91 93 189 186
Other comprehensive income (loss), net of tax 91 93 189 186
Ending Balance (5,482) (5,687) (5,482) (5,687)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (68,563) (52,357) (51,682) (53,710)
Other comprehensive loss before reclassifications:        
(Loss) gain on foreign currency translation adjustment 5,472 1,100 (11,409) 2,453
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain 0 0 0 0
Other comprehensive income (loss), net of tax 5,472 1,100 (11,409) 2,453
Ending Balance (63,091) (51,257) (63,091) (51,257)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (74,136) (58,137) (57,353) (59,583)
Amounts reclassified from AOCI:        
Ending Balance $ (68,573) $ (56,944) $ (68,573) $ (56,944)