Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 740,096
Other comprehensive income before reclassifications	8,785	$ 10,441
Amounts reclassified from AOCI	750	563
Net current-period other comprehensive income	9,535	11,004
Ending Balance	774,583
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(70,561)	(96,775)
Other comprehensive income before reclassifications	8,785	10,441
Net current-period other comprehensive income	8,785	10,441
Ending Balance	(61,776)	(86,334)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(29,093)	(30,790)
Amounts reclassified from AOCI	753	565
Net current-period other comprehensive income	753	565
Ending Balance	(28,340)	(30,225)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	91	100
Amounts reclassified from AOCI	(3)	(2)
Net current-period other comprehensive income	(3)	(2)
Ending Balance	88	98
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(99,563)	(127,465)
Ending Balance	$ (90,028)	$ (116,461)