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Organization and Limited Liability Company matters - Additional Information (Detail) (USD $)
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1 Months Ended | 6 Months Ended | ||
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Nov. 30, 2000
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Jan. 13, 1999
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Jun. 30, 2012
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Dec. 31, 2011
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| Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] | ||||
| Public offering of Limited Liability Company Units | 15,000,000 | |||
| Public offering of Limited Liability Company Units, price per unit | $ 10 | |||
| Sale of Limited Liability Company Units, number of units | 120,000 | |||
| Proceeds from sale of Limited Liability Company Units | $ 1,200,000 | |||
| Contributions received | 135,700,000 | |||
| Contributions unit received | 13,570,188 | |||
| Contributions of capital | 500 | |||
| Capital investment | $ 100 | |||
| Units issued | 13,560,188 | 13,560,188 | ||
| Units outstanding | 13,560,188 | 13,560,188 | ||
| Reinvestment period | 6 years | |||