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Goodwill, Identifiable Intangible Assets, and Other Long-Lived Assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | $ 225,500,000 |
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill | $ 0 |  |  | 7,300,000 |
Amortization of identifiable intangible assets | $ 15,400,000 | $ 11,300,000 |  | 44,765,000 | $ 34,500,000
United States Industrial Services [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 225,500,000 |
Weighted average cost of capital used for impairment testing |  |  | 12.00% |  |
Perpetual growth rate used for impairment testing |  |  | 2.00% |  |
Goodwill Impairment Testing, Effect of Fifty Basis Point Increase in the Weighted Average Costs of Capital |  |  | $ 22,900,000 |  |
Goodwill Impairment, Testing Effect of Fifty Basis Point Decrease in the Perpetual Growth Rate |  |  | $ 9,000,000.0 |  |
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill |  |  |  | 4,800,000 |
Non-cash expense for impairment of tangible assets |  |  |  | 600,000 |
United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | 0 |
Trade Names (Unamortized) | United States Industrial Services [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  |  | 4,200,000 |
Trade Names (Unamortized) | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  |  | $ 2,500,000 |

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- Definition Goodwill Impairment Testing, Effect of Fifty Basis Point Decrease in the Perpetual Growth Rate + References No definition available. + Details
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- Definition Goodwill Impairment Testing Effect of Fifty Basis Point Increase in the Weighted Average Costs of Capital + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 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=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
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