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Earnings Per Unit - Additional Information (Detail)	3 Months Ended
Earnings Per Unit - Additional Information (Detail)	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Participating securities	349,331	490,591
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Unit [Line Item]
Non-Participating Securities	73,400	383,500
Long-Term Incentive Program
Antidilutive Securities Excluded from Computation of Earnings Per Unit [Line Item]
Non-Participating Securities	712,424

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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- Definition

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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