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Earnings (Loss) Per Share - Additional Information (Detail)
4 Months Ended 12 Months Ended
May 07, 2013
Dec. 31, 2012
Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive units excluded from the computation of earnings per share 5,274,900 5,274,900 5,274,900