Ameresco, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Business Segment Information - Segment Information (Details)

Business Segment Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 173,768	$ 189,142	$ 152,489	$ 115,433	$ 181,061	$ 168,891	$ 142,558	$ 100,731	$ 630,832	$ 593,241	$ 574,171
Unallocated corporate activity									292	6,292	2,759
Net (loss) income					$ 8,654	$ 7,291	$ 2,719	$ (8,281)	(2,551)	10,383	2,414
U.S. Regions
Segment Reporting Information [Line Items]
Revenues									301,371	263,451	250,963
Interest income									0	0	0
Interest income									0	0	0
Depreciation and intangible asset amortization									838	1,352	2,058
Unallocated corporate activity									0	0	0
Net (loss) income									24,800	24,849	13,566
U.S. Federal
Segment Reporting Information [Line Items]
Revenues									127,620	106,192	76,192
Interest income									0	0	0
Interest income									0	0	0
Depreciation and intangible asset amortization									1,209	1,178	1,060
Unallocated corporate activity									0	0	0
Net (loss) income									16,676	14,035	9,553
Canada
Segment Reporting Information [Line Items]
Revenues									49,235	70,492	68,812
Interest income									1,154	1	46
Interest income									1,338	1,369	1,367
Depreciation and intangible asset amortization									1,081	1,288	1,687
Unallocated corporate activity									0	0	0
Net (loss) income									(15,449)	(7,838)	(3,319)
Small-Scale Infrastructure
Segment Reporting Information [Line Items]
Revenues									66,322	58,286	99,355
Interest income									175	43	65
Interest income									3,912	3,188	2,045
Depreciation and intangible asset amortization									14,316	12,892	10,512
Unallocated corporate activity									0	0	0
Net (loss) income									8,613	3,191	9,661
Other
Segment Reporting Information [Line Items]
Revenues									86,284	94,820	78,849
Interest income									0	1	2
Interest income									0	0	0
Depreciation and intangible asset amortization									4,078	4,199	3,119
Unallocated corporate activity									0	0	0
Net (loss) income									(8,677)	(324)	(910)
Consolidated
Segment Reporting Information [Line Items]
Revenues									630,832	593,241	574,171
Interest income									1,329	45	113
Interest income									5,250	4,557	3,412
Depreciation and intangible asset amortization									21,522	20,909	18,436
Unallocated corporate activity									(25,671)	(27,621)	(25,792)
Net (loss) income									$ 25,963	$ 33,913	$ 28,551