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Earnings Per Share - Non-Participating Securities (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Unit Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Awards Outstanding to Non-Participating Securities	73,400	483,500	731,900
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Awards Outstanding to Non-Participating Securities	0	0	25,201
Long-Term Incentive Program [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Awards Outstanding to Non-Participating Securities	718,960	0	0

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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