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Benefit Plans - Summary of Defined Benefit Pension Plan Assets Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Defined benefit pension plan assets	$ 15,274	$ 14,540
Level 1 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Defined benefit pension plan assets	250	133
Level 2 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Defined benefit pension plan assets	15,024	14,407
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Defined benefit pension plan assets

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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