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Earnings Per Share/Common Unit - Additional Information (Detail) (Stock Options) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from earnings per share/unit	0.1	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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