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Benefit Plans - Component of Net Periodic Pension Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Net actuarial loss	$ 43,091	$ 15,415
Deferred tax benefit	(18,031)	(6,430)
Total	$ 25,060	$ 8,985

Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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