Benefit Plans - Component of Net Periodic Pension Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Net actuarial loss	$ 15,415	$ 55,339
Prior service cost		2,267
Deferred tax benefit	(6,430)	(24,077)
Total	$ 8,985	$ 33,529