Employee Benefit Plans (Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ 9,188	$ 3,118	$ (34,837)
Deferred tax (expense) benefit	(3,216)	(1,091)	12,193
Other Comprehensive (Income) Loss, net of tax	$ (5,972)	$ (2,027)	$ 22,644