Condensed Consolidated Statements of Members' Equity (Deficiency) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Statement Of Stockholders Equity [Abstract]
Members' equity (deficiency) beginning balance	$ 8,800,931	$ 19,447,874
Add net income (loss):
Net income (loss)	(10,948,048)	10,585,390
Members' equity before distribution	(2,147,117)	30,033,264
Less distributions:
Distributions	1,944,667	3,889,333
Additional distribution	13,254,000	17,343,000
Total distributions	15,198,667	21,232,333
Members' equity (deficiency) at the end of the period	$ (17,345,784)	$ 8,800,931