XML 124 R111.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Business Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 217,371 | $ 205,375 | $ 196,982 | $ 167,410 | $ 211,133 | $ 204,744 | $ 166,665 | $ 134,610 | $ 787,138 | $ 717,152 | $ 651,227
Interest income |  |  |  |  |  |  |  |  | 282 | 130 | 50
Interest income |  |  |  |  |  |  |  |  | 15,344 | 9,082 | 7,076
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 29,148 | 23,915 | 22,764
Unallocated corporate activity |  |  |  |  |  |  |  |  | (30,415) | (27,195) | (32,225)
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | 72,805 | 55,912 | 48,592
U.S. Regions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 334,344 |  |
U.S. Federal |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 246,309 |  |
Non-solar DG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 82,655 |  |
Operating Segments | U.S. Regions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 334,344 | 290,196 | 276,766
Interest income |  |  |  |  |  |  |  |  | 9 | 2 | 1
Interest income |  |  |  |  |  |  |  |  | 6,188 | 2,672 | 1,055
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 5,578 | 2,974 | 1,901
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | 20,543 | 13,865 | 19,802
Operating Segments | U.S. Federal |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 246,309 | 229,146 | 178,005
Interest income |  |  |  |  |  |  |  |  | 126 | 44 | 11
Interest income |  |  |  |  |  |  |  |  | 1,045 | 1,056 | 942
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 2,772 | 2,623 | 2,588
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | 36,332 | 29,261 | 22,246
Operating Segments | Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 38,982 | 43,803 | 50,448
Interest income |  |  |  |  |  |  |  |  | 0 | 1 | 0
Interest income |  |  |  |  |  |  |  |  | 1,917 | 1,927 | 1,737
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 1,155 | 1,178 | 1,090
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | (2,746) | 1,751 | (2,330)
Operating Segments | Non-solar DG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 82,655 | 79,220 | 74,395
Interest income |  |  |  |  |  |  |  |  | 147 | 83 | 38
Interest income |  |  |  |  |  |  |  |  | 6,172 | 3,389 | 3,319
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 18,101 | 15,259 | 14,557
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | 13,412 | 8,115 | 9,301
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 84,848 | 74,787 | 71,613
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 22 | 38 | 23
Depreciation and intangible asset amortization |  |  |  |  |  |  |  |  | 1,542 | 1,881 | 2,628
Income before taxes, excluding unallocated corporate activity |  |  |  |  |  |  |  |  | 5,264 | 2,920 | (427)
Consolidation, Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | (30,415) | (27,195) | (32,225)
Consolidation, Eliminations | U.S. Regions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidation, Eliminations | U.S. Federal |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidation, Eliminations | Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidation, Eliminations | Non-solar DG |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Consolidation, Eliminations | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate activity |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

X
- Definition Income before Income Taxes and Unallocated Corporate Expenses + References No definition available. + Details
Name: | amrc_IncomeBeforeIncomeTaxesAndUnallocatedCorporateExpenses
Namespace Prefix: | amrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unallocated Corporate Expense Segment + References No definition available. + Details
Name: | amrc_UnallocatedCorporateExpenseSegment
Namespace Prefix: | amrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_InterestIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amrc_OtherUSRegionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amrc_USFederalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amrc_SmallScaleInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amrc_CanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=srt_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |