Restructuring Programs and Separation Costs - Schedule of Restructuring Program Activity (Detail) - Severance and Other Employment Expenses [Member] - 2016 Restructuring Programs [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring Cost And Reserve [Line Items]
Costs incurred	$ 8,904
Payments made	(1,062)
Liability, ending balance	$ 7,842