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Earnings per Share (Additional Information) (Detail)	3 Months Ended		9 Months Ended
Earnings per Share (Additional Information) (Detail)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Number of options excluded from computation of diluted earnings per share	0	137,324	0	115,518

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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