Other Assets (Detail) - Composition of Other Assets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Benefit plan-related assets	$ 45,958	$ 42,168
Non-current deferred tax assets	27,275	26,418
Other	14,046	38,298
Total other assets	$ 87,279	$ 106,884