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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, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (54,151) $ (35,134)
Other comprehensive income (loss) before reclassifications:    
Gain (loss) on foreign currency translation adjustment 3,867 (8,614)
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial loss 77 86
Other comprehensive income (loss), net of tax 3,944 (8,528)
Ending Balance (50,207) (43,662)
Defined Benefit Pension Plan Activity [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (6,235) (7,007)
Other comprehensive income (loss) before reclassifications:    
Gain (loss) on foreign currency translation adjustment 0 0
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial loss 77 86
Other comprehensive income (loss), net of tax 77 86
Ending Balance (6,158) (6,921)
Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (47,916) (28,127)
Other comprehensive income (loss) before reclassifications:    
Gain (loss) on foreign currency translation adjustment 3,867 (8,614)
Amounts reclassified from AOCI:    
Amortization of defined benefit pension actuarial loss 0 0
Other comprehensive income (loss), net of tax 3,867 (8,614)
Ending Balance $ (44,049) $ (36,741)