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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (44,005) $ (13,572) $ (35,134) $ (17,702)
Other comprehensive income (loss) before reclassifications:        
Loss on foreign currency translation adjustment (10,001) (9,813) (19,046) (5,688)
Amounts reclassified from AOCI:        
Recognized net actuarial loss 99 2 273 7
Other comprehensive income (loss), net of tax (9,902) (9,811) (18,773) (5,681)
Ending Balance (53,907) (23,383) (53,907) (23,383)
Defined Benefit Pension Plan Activity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,833) (1,900) (7,007) (1,905)
Other comprehensive income (loss) before reclassifications:        
Loss on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Recognized net actuarial loss 99 2 273 7
Other comprehensive income (loss), net of tax 99 2 273 7
Ending Balance (6,734) (1,898) (6,734) (1,898)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (37,172) (11,672) (28,127) (15,797)
Other comprehensive income (loss) before reclassifications:        
Loss on foreign currency translation adjustment (10,001) (9,813) (19,046) (5,688)
Amounts reclassified from AOCI:        
Recognized net actuarial loss 0 0 0 0
Other comprehensive income (loss), net of tax (10,001) (9,813) (19,046) (5,688)
Ending Balance $ (47,173) $ (21,485) $ (47,173) $ (21,485)