Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Effect of Adjustments to Revise Balance Sheet (Parenthetical) (Detail)

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Summary of Significant Accounting Policies - Effect of Adjustments to Revise Balance Sheet (Parenthetical) (Detail) (USD $)
Dec. 31, 2012
Regulatory Assets [Abstract]  
Income taxes receivable $ 234,891