Employer Sponsored Benefit Plan (Components of Net Periodic Benefit Cost) (Detail) - Domestic Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	$ 2,139	$ 2,066	$ 2,348
Expected return on plan assets	(2,419)	(2,360)	(2,798)
Amortization of actuarial net loss	933	897	725
Pension settlement cost	0	0	4,914
Total net periodic benefit cost	$ 653	$ 603	$ 5,189