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Earnings Per Share - Additional Information (Detail)	3 Months Ended
Earnings Per Share - Additional Information (Detail)	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share Basic And Diluted [Line Items]
Weighted average number of shares, Recognition and Retention Plan	605,463	615,703
Stock Options [Member]
Earnings Per Share Basic And Diluted [Line Items]
Stock options having antidilutive effect on earnings per share	164,962	11,623

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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