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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 634,604  
Other comprehensive income before reclassifications $ 9,811 $ (2,211) 26,229 $ 7,688
Amounts reclassified from AOCI 537 499 1,664 1,633
Net current-period other comprehensive income 10,348 (1,712) 27,893 9,321
Ending Balance 734,933   734,933  
Foreign Currency Translation Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (80,357) (78,406) (96,775) (88,337)
Other comprehensive income before reclassifications 9,811 (2,209) 26,229 7,722
Net current-period other comprehensive income 9,811 (2,209) 26,229 7,722
Ending Balance (70,546) (80,615) (70,546) (80,615)
Defined Benefit Pension Plan Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (29,658) (35,696) (30,790) (36,825)
Amounts reclassified from AOCI 539 497 1,671 1,626
Net current-period other comprehensive income 539 497 1,671 1,626
Ending Balance (29,119) (35,199) (29,119) (35,199)
Cash Flow Hedge Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 95 47 100 74
Other comprehensive income before reclassifications   (2)   (34)
Amounts reclassified from AOCI (2) 2 (7) 7
Net current-period other comprehensive income (2)   (7) (27)
Ending Balance 93 47 93 47
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (109,920) (114,055) (127,465) (125,088)
Ending Balance $ (99,572) $ (115,767) $ (99,572) $ (115,767)