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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (57,369) $ (54,151)  
Other comprehensive income before reclassifications:      
Gain (loss) on foreign currency translation adjustment 10,070 (3,579) $ (19,789)
Gain (loss) on unfunded pension obligations (410) 35 408
Amounts reclassified from AOCI:      
Recognized net actuarial loss 269 326 364
Other comprehensive income (loss), net of tax 9,929 (3,218) (19,017)
Ending Balance (47,440) (57,369) (54,151)
Defined Benefit Pension Plan Activity [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (5,874) (6,235)  
Other comprehensive income before reclassifications:      
Gain (loss) on foreign currency translation adjustment 0 0  
Gain (loss) on unfunded pension obligations (410) 35 408
Amounts reclassified from AOCI:      
Recognized net actuarial loss 269 326 364
Other comprehensive income (loss), net of tax (141) 361  
Ending Balance (6,014) (5,874) (6,235)
Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (51,495) (47,916)  
Other comprehensive income before reclassifications:      
Gain (loss) on foreign currency translation adjustment 10,070 (3,579) (19,789)
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 10,070 (3,579)  
Ending Balance $ (41,425) $ (51,495) $ (47,916)