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Schedule of Reconciliation of Numerator and Denominator of Earnings Per Common Share (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]
Common shares excluded from the calculation of diluted net income (loss) per share	2,784,779

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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