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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (50,207) $ (43,662) $ (54,151) $ (35,134)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment (1,855) (431) 2,012 (9,045)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial loss 76 88 153 174
Net current period other comprehensive income (loss) (1,779) (343) 2,165 (8,871)
Ending Balance (51,986) (44,005) (51,986) (44,005)
Defined Benefit Pension Plan Activity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,158) (6,921) (6,235) (7,007)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 0 0 0 0
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial loss 76 88 153 174
Net current period other comprehensive income (loss) 76 88 153 174
Ending Balance (6,082) (6,833) (6,082) (6,833)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (44,049) (36,741) (47,916) (28,127)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment (1,855) (431) 2,012 (9,045)
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial loss 0 0 0 0
Net current period other comprehensive income (loss) (1,855) (431) 2,012 (9,045)
Ending Balance $ (45,904) $ (37,172) $ (45,904) $ (37,172)