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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, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 238,537  
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 3,831 $ 5,472
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 91 72
Other comprehensive income, net of tax 3,922 5,544
Ending Balance 247,021  
Defined Benefit Pension Plan Activity [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (6,014) (5,874)
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 0 0
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 91 72
Other comprehensive income, net of tax 91 72
Ending Balance (5,923) (5,802)
Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (41,425) (51,495)
Other comprehensive income before reclassifications:    
Gain on foreign currency translation adjustment 3,831 5,472
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 0 0
Other comprehensive income, net of tax 3,831 5,472
Ending Balance (37,594) (46,023)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (47,439) (57,369)
Amounts reclassified from AOCI:    
Ending Balance $ (43,517) $ (51,825)