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Stock-based Compensation - Additional Information (Detail) (2008 LTIP, USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be granted under stock compensation plan	351,718
Stock based compensation expense, net of tax	$ 20	$ 20
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of option awards	5 years
Contractual term of option awards	10

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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