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Schedule of Market Values of Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 104,074	$ 87,940	$ 73,402
Equity Securities \| U.S. Large Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	22,800	18,921
Equity Securities \| U.S. Mid Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,566	1,281
Equity Securities \| U.S. Small-Mid Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	7,738	6,332
Equity Securities \| U.S. Small Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,583	1,282
Equity Securities \| International Developed
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	10,779	8,692
Equity Securities \| Emerging Markets
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	3,912	3,123
Fixed Income Securities \| Long Duration Fixed Income
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	51,355	44,587
Fixed income securities \| REIT Fund
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	3,904	3,269
Cash \| Cash Equivalents
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	437	453
Fair Value, Inputs, Level 2
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	104,074	87,940
Fair Value, Inputs, Level 2 \| Equity Securities \| U.S. Large Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	22,800	18,921
Fair Value, Inputs, Level 2 \| Equity Securities \| U.S. Mid Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,566	1,281
Fair Value, Inputs, Level 2 \| Equity Securities \| U.S. Small-Mid Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	7,738	6,332
Fair Value, Inputs, Level 2 \| Equity Securities \| U.S. Small Cap
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,583	1,282
Fair Value, Inputs, Level 2 \| Equity Securities \| International Developed
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	10,779	8,692
Fair Value, Inputs, Level 2 \| Equity Securities \| Emerging Markets
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	3,912	3,123
Fair Value, Inputs, Level 2 \| Fixed Income Securities \| Long Duration Fixed Income
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	51,355	44,587
Fair Value, Inputs, Level 2 \| Fixed income securities \| REIT Fund
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	3,904	3,269
Fair Value, Inputs, Level 2 \| Cash \| Cash Equivalents
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 437	$ 453

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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