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Project Assets - Summary of Project Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of Project Assets [Abstract]    
Under development-Company as project owner $ 113,948sopw_UnderDevelopmentcompanyAsProjectOwner $ 75,346sopw_UnderDevelopmentcompanyAsProjectOwner
Under development-Company expected to be project owner upon the completion of construction 25,420sopw_ProjectAssetsUnderDevelopment [1] 19,849sopw_ProjectAssetsUnderDevelopment [1]
Total project assets 139,368sopw_ConstructionInProgressCurrentAndNoncurrent 95,195sopw_ConstructionInProgressCurrentAndNoncurrent
Current, net of impairment loss 107,354sopw_ConstructionInProgressCurrent 73,930sopw_ConstructionInProgressCurrent
Noncurrent 32,014us-gaap_ConstructionInProgressGross 21,265us-gaap_ConstructionInProgressGross
Total project assets $ 139,368sopw_ConstructionInProgressCurrentAndNoncurrent $ 95,195sopw_ConstructionInProgressCurrentAndNoncurrent
[1] All of the projects costs under this category were recorded as project assets, noncurrent.