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Shareholders' Equity - Additional Information (Detail)	3 Months Ended
Shareholders' Equity - Additional Information (Detail)	Mar. 31, 2013
Statement Of Stockholders Equity [Abstract]
Stock option exercised	83,000

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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