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Earnings Per Share/Unit - Additional Information (Detail) (Stock Options [Member]) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from earnings per share/unit	0.1

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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