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12. Commitments and Contingencies (Details) - Performance Guarantees (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Other Commitments [Line Items]    
Estimated Test Guarantees Liability 1.0fslr_EstimatedTestGuaranteesLiability $ 4.3fslr_EstimatedTestGuaranteesLiability
Estimated Test Guarantees Liability Current 1.0fslr_EstimatedTestGuaranteesLiabilityCurrent $ 4.3fslr_EstimatedTestGuaranteesLiabilityCurrent
Maximum [Member]    
Other Commitments [Line Items]    
Availability Guarantee Period 5 years