Employee Benefit Plans (Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ 3,118	$ (34,837)	$ 35,293
Deferred tax (expense) benefit	(1,091)	12,193	(12,353)
Other comprehensive income (loss), net of tax	$ 2,027	$ (22,644)	$ 22,940