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Employee Benefit Plans - Schedule of Employee Postretirement Benefit Plans (Detail) (OPEB plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
OPEB plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 39	$ 59	$ 118	$ 177
Amortization of prior service credit	(175)	(200)	(524)	(600)
Recognized actuarial gain	(24)		(74)
Total	$ (160)	$ (141)	$ (480)	$ (423)

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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