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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
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 249,370 $ 238,537
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 1,353 3,832
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 93 91
Other comprehensive income, net of tax 1,446 3,923
Ending Balance 250,203 247,021
Defined Benefit Pension Plan Activity [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (5,873) (6,015)
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 0 0
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 93 91
Other comprehensive income, net of tax 93 91
Ending Balance (5,780) (5,924)
Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (53,710) (41,425)
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 1,353 3,832
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 0 0
Other comprehensive income, net of tax 1,353 3,832
Ending Balance (52,357) (37,593)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (59,583) (47,440)
Amounts reclassified from AOCI:    
Ending Balance $ (58,137) $ (43,517)