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Quarterly Financial Data (Parenthetical) (Detail) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Real Goods Solar Deconsolidated | Sep. 30, 2012 Real Goods Solar Deconsolidated | Jun. 30, 2012 Real Goods Solar Deconsolidated | Mar. 31, 2012 Real Goods Solar Deconsolidated | Dec. 31, 2011 Real Goods Solar Consolidated
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Loss from equity method investment | $ (18,410,000) | [1] |  |  | $ (830,000) | $ (15,940,000) | [2] | $ (944,000) | $ (696,000) |
Income tax expense benefits |  |  |  |  |  | 5,700,000 |  |  |  | 7,100,000
Goodwill impairment charges |  |  | 22,456,000 |  |  |  |  |  |  | 22,500,000
Loss from deconsolidation pretax |  |  | $ (4,550,000) | [1] |  |  |  |  |  | $ (4,500,000)
[1] | RSOL was deconsolidated and accounted for as an equity method investment effective December 31, 2011. Consequently, RSOL is reported as an equity method investment for the year ended December 31, 2012 and as a consolidated subsidiary for the years ended December 31, 2011 and 2010.
[2] | During the quarter ended September 30, 2012, we recorded a noncash loss from our equity method investment in RSOL of $15.9 million and related income tax benefits of $5.7 million. See Note 3. Equity Method Investment and Receivable From Investee.

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