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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, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (57,369) $ (54,151)
Other comprehensive income (loss) before reclassifications:    
Gain on foreign currency translation adjustment 5,472 3,867
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 72 77
Other comprehensive income, net of tax 5,544 3,944
Ending Balance (51,825) (50,207)
Defined Benefit Pension Plan Activity [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (5,874) (6,235)
Other comprehensive income (loss) before reclassifications:    
Gain on foreign currency translation adjustment 0 0
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 72 77
Other comprehensive income, net of tax 72 77
Ending Balance (5,802) (6,158)
Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (51,495) (47,916)
Other comprehensive income (loss) before reclassifications:    
Gain on foreign currency translation adjustment 5,472 3,867
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial gain 0 0
Other comprehensive income, net of tax 5,472 3,867
Ending Balance $ (46,023) $ (44,049)