Corporate Restructuring and Other Organizational Changes - Components of Corporate Restructuring and Other Reorganization Activities from Recent Acquisitions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 4,559	$ 1,045
Restructuring charges (adjustments) incurred, net	2,447	5,041
Amounts paid during the period	(1,285)	(1,432)
Foreign currency translation adjustments	224	(95)
Ending balance	5,945	4,559	$ 1,045
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance		777
Amounts paid during the period		(778)	(2,900)
Foreign currency translation adjustments		1
Ending balance			777
Facility Closures [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	4,559	268
Restructuring charges (adjustments) incurred, net	2,447	5,041
Amounts paid during the period	(1,285)	(654)
Foreign currency translation adjustments	224	(96)
Ending balance	$ 5,945	$ 4,559	$ 268