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Total Capital and Net Income Per Unit - Incentive Distributions (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2012
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Minimum quarterly distribution 0.4125
Minimum [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Minimum quarterly distribution 0.4125
Minimum [Member] | Up to $0.4625 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.4125
Minimum [Member] | Above $0.4625 up to $0.5375 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.4625
Minimum [Member] | Above $0.5375 up to $0.65 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.5375
Minimum [Member] | Above $0.65 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.6500
Maximum [Member] | Up to $0.4625 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.4625
Maximum [Member] | Above $0.4625 up to $0.5375 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.5375
Maximum [Member] | Above $0.5375 up to $0.65 [Member]
  
Incentive Distribution Made to Managing Member or General Partner [Line Items]  
Exceeded cash distribution per unit 0.6500