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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (48,932) $ (51,986) $ (57,369) $ (54,151)
Other comprehensive income before reclassifications:        
Gain on foreign currency translation adjustment 2,960 1,286 11,242 3,298
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain (loss) 50 91 205 244
Other comprehensive income, net of tax 3,010 1,377 11,447 3,542
Ending Balance (45,922) (50,609) (45,922) (50,609)
Defined Benefit Pension Plan Activity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (5,719) (6,082) (5,874) (6,235)
Other comprehensive income before reclassifications:        
Gain on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain (loss) 50 91 205 244
Other comprehensive income, net of tax 50 91 205 244
Ending Balance (5,669) (5,991) (5,669) (5,991)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (43,213) (45,904) (51,495) (47,916)
Other comprehensive income before reclassifications:        
Gain on foreign currency translation adjustment 2,960 1,286 11,242 3,298
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain (loss) 0 0 0 0
Other comprehensive income, net of tax 2,960 1,286 11,242 3,298
Ending Balance $ (40,253) $ (44,618) $ (40,253) $ (44,618)