Employee Benefit Plans (Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ 34,837	$ (35,293)	$ 9,405
Deferred tax (expense) benefit	(12,193)	12,353	(3,292)
Defined Benefit Pension Plans Recognized As Component Of Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(34,837)	35,293	(9,405)
Deferred tax (expense) benefit	12,193	(12,353)	3,292
Other comprehensive income (loss), net of tax	$ (22,644)	$ 22,940	$ (6,113)