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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 740,096  
Other comprehensive income before reclassifications $ (2,503) $ 9,811 (28,730) $ 26,229
Amounts reclassified from AOCI 786 537 2,286 1,664
Net current-period other comprehensive income (1,717) 10,348 (26,444) 27,893
Ending Balance 777,651   777,651  
Foreign Currency Translation Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (96,788) (80,357) (70,561) (96,775)
Other comprehensive income before reclassifications (2,503) 9,811 (28,730) 26,229
Net current-period other comprehensive income (2,503) 9,811 (28,730) 26,229
Ending Balance (99,291) (70,546) (99,291) (70,546)
Defined Benefit Pension Plan Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (27,588) (29,658) (29,093) (30,790)
Amounts reclassified from AOCI 788 539 2,293 1,671
Net current-period other comprehensive income 788 539 2,293 1,671
Ending Balance (26,800) (29,119) (26,800) (29,119)
Cash Flow Hedge Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 86 95 91 100
Amounts reclassified from AOCI (2) (2) (7) (7)
Net current-period other comprehensive income (2) (2) (7) (7)
Ending Balance 84 93 84 93
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (124,290) (109,920) (99,563) (127,465)
Ending Balance $ (126,007) $ (99,572) $ (126,007) $ (99,572)