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Accumulated Other Comprehensive Income ("AOCI") - Summary of Total Changes in AOCI by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (35,134) $ (17,702)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment (19,789) (12,330) $ (8,457)
Gain (loss) on unfunded pension obligations 408 (5,112) 4,113
Amounts reclassified from AOCI:      
Recognized net actuarial loss 364 10 306
Other comprehensive income (loss), net of tax (19,017) (17,432) (4,038)
Ending Balance (54,151) (35,134) (17,702)
Unrecognized Pension Benefit Cost [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (7,007) (1,905)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment 0 0  
Gain (loss) on unfunded pension obligations 408 (5,112) 4,113
Amounts reclassified from AOCI:      
Recognized net actuarial loss 364 10 306
Other comprehensive income (loss), net of tax 772 (5,102)  
Ending Balance (6,235) (7,007) (1,905)
Cumulative Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (28,127) (15,797)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment (19,789) (12,330) (8,457)
Gain (loss) on unfunded pension obligations 0 0  
Amounts reclassified from AOCI:      
Recognized net actuarial loss 0 0  
Other comprehensive income (loss), net of tax (19,789) (12,330)  
Ending Balance $ (47,916) $ (28,127) $ (15,797)