Members' Capital - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Other Members Capital Account [Line Items]
Other Members capital account, units issued	13,560,188	13,560,188
Other Members capital account, units outstanding	13,560,188	13,560,188
Other Members capital account, units authorized	15,000,000	15,000,000
Potential repurchase price of Units as a percentage of holder's capital account	100.00%
Initial Member
Other Members Capital Account [Line Items]
Other Members capital account, units issued	50	50
Other Members'
Other Members Capital Account [Line Items]
Allocation of net income, net losses, and distributions	92.50%
Managing Member'
Other Members Capital Account [Line Items]
Allocation of net income, net losses, and distributions	7.50%