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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (43,662) $ (15,870) $ (35,134) $ (17,702)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment (431) 2,295 (9,045) 4,125
Amounts reclassified from AOCI:        
Recognized net actuarial loss 88 3 174 5
Other comprehensive income (loss), net of tax (343) 2,298 (8,871) 4,130
Ending Balance (44,005) (13,572) (44,005) (13,572)
Defined Benefit Pension Plan Activity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,921) (1,903) (7,007) (1,905)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Recognized net actuarial loss 88 3 174 5
Other comprehensive income (loss), net of tax 88 3 174 5
Ending Balance (6,833) (1,900) (6,833) (1,900)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (36,741) (13,967) (28,127) (15,797)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment (431) 2,295 (9,045) 4,125
Amounts reclassified from AOCI:        
Recognized net actuarial loss 0 0 0 0
Other comprehensive income (loss), net of tax (431) 2,295 (9,045) 4,125
Ending Balance $ (37,172) $ (11,672) $ (37,172) $ (11,672)