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Earnings Per Share of Common Stock - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Line Items]
Shares excluded in computation of diluted earning per share	71,411	67,573

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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