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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (54,151) $ (35,134)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment (3,579) (19,789) $ (12,330)
Gain (loss) on unfunded pension obligations 35 408 (5,112)
Amounts reclassified from AOCI:      
Recognized net actuarial loss 326 364 10
Net current period other comprehensive income (loss) (3,218) (19,017) (17,432)
Ending Balance (57,369) (54,151) (35,134)
Unrecognized Pension Benefit Cost [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (6,235) (7,007)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment 0 0  
Gain (loss) on unfunded pension obligations 35 408 (5,112)
Amounts reclassified from AOCI:      
Recognized net actuarial loss 326 364 10
Net current period other comprehensive income (loss) 361 772  
Ending Balance (5,874) (6,235) (7,007)
Cumulative Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (47,916) (28,127)  
Other comprehensive income before reclassifications:      
Loss on foreign currency translation adjustment (3,579) (19,789) (12,330)
Gain (loss) on unfunded pension obligations 0 0  
Amounts reclassified from AOCI:      
Recognized net actuarial loss 0 0  
Net current period other comprehensive income (loss) (3,579) (19,789)  
Ending Balance $ (51,495) $ (47,916) $ (28,127)