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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (51,825) $ (50,207) $ (57,369) $ (54,151)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 2,810 (1,855) 8,282 2,012
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain (loss) 83 76 155 153
Other comprehensive income (loss), net of tax 2,893 (1,779) 8,437 2,165
Ending Balance (48,932) (51,986) (48,932) (51,986)
Defined Benefit Pension Plan Activity [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (5,802) (6,158) (5,874) (6,235)
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 gain (loss) 83 76 155 153
Other comprehensive income (loss), net of tax 83 76 155 153
Ending Balance (5,719) (6,082) (5,719) (6,082)
Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (46,023) (44,049) (51,495) (47,916)
Other comprehensive income (loss) before reclassifications:        
Gain (loss) on foreign currency translation adjustment 2,810 (1,855) 8,282 2,012
Amounts reclassified from AOCI:        
Amortization of defined benefit pension actuarial gain (loss) 0 0 0 0
Other comprehensive income (loss), net of tax 2,810 (1,855) 8,282 2,012
Ending Balance $ (43,213) $ (45,904) $ (43,213) $ (45,904)