Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 740,096
Other comprehensive income before reclassifications	(45,000)	$ 25,632	$ (4,639)
Amounts reclassified from AOCI	3,080	2,270	2,262
Net current period other comprehensive income	(41,920)	27,902	(2,377)
Ending Balance	783,766	740,096
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(70,561)	(96,775)	(88,337)
Other comprehensive income before reclassifications	(37,920)	26,214	(8,438)
Net current period other comprehensive income	(37,920)	26,214	(8,438)
Ending Balance	(108,481)	(70,561)	(96,775)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(29,093)	(30,790)	(36,825)
Other comprehensive income before reclassifications	(7,080)	(582)	3,818
Amounts reclassified from AOCI	3,090	2,279	2,217
Net current period other comprehensive income	(3,990)	1,697	6,035
Ending Balance	(33,083)	(29,093)	(30,790)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	91	100	74
Other comprehensive income before reclassifications			(19)
Amounts reclassified from AOCI	(10)	(9)	45
Net current period other comprehensive income	(10)	(9)	26
Ending Balance	81	91	100
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(99,563)	(127,465)	(125,088)
Ending Balance	$ (141,483)	$ (99,563)	$ (127,465)