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Earnings Per Share - Additional Information (Detail)	12 Months Ended
Earnings Per Share - Additional Information (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share Basic And Diluted [Line Items]
Weighted average number of shares, Recognition and Retention Plan	625,555	642,008	612,097
Weighted average number of shares, treasury stock	1,879,440	2,223,306	1,964,825
Stock Options [Member]
Earnings Per Share Basic And Diluted [Line Items]
Stock options having antidilutive effect on earnings per share	13,101	483,696	752,188

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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