Annual report pursuant to Section 13 and 15(d)

Summary of Common Units Received Under Adjustment Agreement (Detail)

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Summary of Common Units Received Under Adjustment Agreement (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]      
Fair Value of Common Units Received $ 98,797 $ 9,137 $ 9,302
Annual Common Unit Adjustment
     
Schedule of Equity Method Investments [Line Items]      
Fair Value of Common Units Received 8,869 9,137 9,302
Number of common Units Received 588,024 598,724 549,417
Date Common Units Received Mar. 28, 2013 Mar. 29, 2012 Mar. 31, 2011
Extraordinary Common Unit Adjustment
     
Schedule of Equity Method Investments [Line Items]      
Fair Value of Common Units Received $ 89,928    
Number of common Units Received 5,315,837    
Date Common Units Received May 29, 2013