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Deferred Compensation Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation plan liability	$ 9,500,000	$ 6,300,000
Cash surrender value of the policies	10,400,000	5,800,000
Deferred compensation expense charged to operations for Company's matching contributions	285,000	306,000	231,000
Benefits paid	$ 616,000	$ 77,000
Employee
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage of receipt of base compensation	75.00%
Percentage of receipt of incentive pay compensation	100.00%
Non Employee Director
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage of receipt of base compensation	100.00%
Percentage of receipt of incentive pay compensation	100.00%

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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