v2.4.0.8
Segment and geographic information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment and related information          
Project revenues $ 139,000,000 $ 101,400,000 $ 279,200,000 $ 220,100,000  
Segment assets 3,567,400,000 3,428,600,000 3,567,400,000 3,428,600,000 4,002,700,000
Project Adjusted EBITDA 56,200,000 45,400,000 136,800,000 111,900,000  
Change in fair value of derivative instruments (26,800,000) 2,100,000 (38,300,000) 59,600,000  
Depreciation and amortization 50,600,000 41,300,000 103,000,000 81,100,000  
Interest, net 9,500,000 6,400,000 19,000,000 12,400,000  
Other project expense 7,300,000 3,100,000 6,400,000 3,300,000  
Project income (loss) 15,600,000 (7,500,000) 46,700,000 (44,500,000)  
Administration 11,800,000 8,000,000 20,100,000 15,700,000  
Interest, net 25,300,000 21,400,000 51,200,000 43,400,000  
Foreign exchange loss (gain) (14,500,000) (4,200,000) (22,000,000) (3,200,000)  
Other income (expense), net (9,500,000) (6,000,000) (9,500,000) (6,000,000)  
Income (loss) from continuing operations before income taxes 2,500,000 (26,700,000) 6,900,000 (94,400,000)  
Income tax expense (benefit) 600,000 (5,300,000) (1,900,000) (22,200,000)  
Net income (loss) from continuing operations 1,900,000 (21,400,000) 8,800,000 (72,200,000)  
Income (loss) from discontinued operations (700,000) 19,300,000 200,000 30,900,000  
Net income (loss) 1,200,000 (2,100,000) 9,000,000 (41,300,000)  
Rollcast
          
Segment and related information          
Ownership interest (as a percent)     60.00%    
Northeast
          
Segment and related information          
Project revenues 52,800,000 45,900,000 120,600,000 112,800,000  
Segment assets 1,144,100,000 1,180,000,000 1,144,100,000 1,180,000,000  
Project Adjusted EBITDA 26,000,000 22,400,000 71,900,000 64,800,000  
Change in fair value of derivative instruments (8,300,000) (1,600,000) (16,400,000) 56,400,000  
Depreciation and amortization 17,800,000 20,200,000 37,900,000 37,700,000  
Interest, net 4,300,000 4,700,000 8,700,000 9,400,000  
Other project expense 500,000 300,000 900,000 500,000  
Project income (loss) 11,700,000 (1,200,000) 40,800,000 (39,200,000)  
Income (loss) from continuing operations before income taxes 11,700,000 (1,200,000) 40,800,000 (39,200,000)  
Net income (loss) from continuing operations 11,700,000 (1,200,000) 40,800,000 (39,200,000)  
Net income (loss) 11,700,000 (1,200,000) 40,800,000 (39,200,000)  
Southeast
          
Segment and related information          
Project revenues 6,200,000   6,200,000    
Segment assets 229,600,000 434,300,000 229,600,000 434,300,000  
Project Adjusted EBITDA 2,400,000 2,100,000 4,500,000 4,200,000  
Change in fair value of derivative instruments (2,300,000) 3,700,000 (3,600,000) 3,200,000  
Depreciation and amortization 3,000,000 1,400,000 4,500,000 2,800,000  
Interest, net 1,200,000   1,200,000    
Other project expense 100,000   100,000    
Project income (loss) 400,000 (3,000,000) 2,300,000 (1,800,000)  
Income (loss) from continuing operations before income taxes 400,000 (3,000,000) 2,300,000 (1,800,000)  
Net income (loss) from continuing operations 400,000 (3,000,000) 2,300,000 (1,800,000)  
Income (loss) from discontinued operations (1,400,000) 19,600,000 (1,100,000) 30,200,000  
Net income (loss) (1,000,000) 16,600,000 1,200,000 28,400,000  
Northwest
          
Segment and related information          
Project revenues 21,300,000 16,700,000 46,000,000 32,000,000  
Segment assets 1,118,900,000 784,200,000 1,118,900,000 784,200,000  
Project Adjusted EBITDA 12,300,000 12,400,000 33,600,000 25,900,000  
Change in fair value of derivative instruments (15,300,000)   (18,300,000)    
Depreciation and amortization 14,800,000 10,600,000 30,600,000 21,000,000  
Interest, net 4,700,000 1,500,000 9,400,000 2,700,000  
Project income (loss) 8,100,000 300,000 11,900,000 2,200,000  
Income (loss) from continuing operations before income taxes 8,100,000 300,000 11,900,000 2,200,000  
Net income (loss) from continuing operations 8,100,000 300,000 11,900,000 2,200,000  
Net income (loss) 8,100,000 300,000 11,900,000 2,200,000  
Southwest
          
Segment and related information          
Project revenues 58,700,000 38,200,000 106,700,000 73,700,000  
Segment assets 939,500,000 987,700,000 939,500,000 987,700,000  
Project Adjusted EBITDA 19,000,000 12,600,000 35,000,000 24,700,000  
Depreciation and amortization 14,800,000 9,100,000 29,800,000 19,600,000  
Interest, net 300,000 300,000 500,000 300,000  
Other project expense   2,700,000   2,800,000  
Project income (loss) 3,900,000 500,000 4,700,000 2,000,000  
Income (loss) from continuing operations before income taxes 3,900,000 500,000 4,700,000 2,000,000  
Net income (loss) from continuing operations 3,900,000 500,000 4,700,000 2,000,000  
Income (loss) from discontinued operations 700,000 (300,000) 1,300,000 700,000  
Net income (loss) 4,600,000 200,000 6,000,000 2,700,000  
Un-allocated Corporate
          
Segment and related information          
Project revenues   600,000 (300,000) 1,600,000  
Segment assets 135,300,000 42,400,000 135,300,000 42,400,000  
Project Adjusted EBITDA (3,500,000) (4,100,000) (8,200,000) (7,700,000)  
Change in fair value of derivative instruments (900,000)        
Depreciation and amortization 200,000   200,000    
Interest, net (1,000,000) (100,000) (800,000)    
Other project expense 6,700,000 100,000 5,400,000    
Project income (loss) (8,500,000) (4,100,000) (13,000,000) (7,700,000)  
Administration 11,800,000 8,000,000 20,100,000 15,700,000  
Interest, net 25,300,000 21,400,000 51,200,000 43,400,000  
Foreign exchange loss (gain) (14,500,000) (4,200,000) (22,000,000) (3,200,000)  
Other income (expense), net (9,500,000) (6,000,000) (9,500,000) (6,000,000)  
Income (loss) from continuing operations before income taxes (21,600,000) (23,300,000) (52,800,000) (57,600,000)  
Income tax expense (benefit) 600,000 (5,300,000) (1,900,000) (22,200,000)  
Net income (loss) from continuing operations (22,200,000) (18,000,000) (50,900,000) (35,400,000)  
Net income (loss) $ (22,200,000) $ (18,000,000) $ (50,900,000) $ (35,400,000)