Items to be Recognized in 2017 as Component of Net Periodic Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations in excess of plan assets, projected benefit obligation	$ 71,000	$ 60,100
Pension Benefits [Member]
Items to be recognized in 2017 as a component of net periodic cost
Net actuarial loss (gain)	7,127
Prior service cost (credit)	297
Net periodic cost (credit) to be recorded in 2017	7,424
Other Postretirement Benefits [Member]
Items to be recognized in 2017 as a component of net periodic cost
Net actuarial loss (gain)	(556)
Prior service cost (credit)	(3,418)
Net periodic cost (credit) to be recorded in 2017	$ (3,974)