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Goodwill and Other Intangible Assets - Rollforward of Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Other Intangible Assets [Line Items] |  |
Other intangible assets, gross |  | $ 432,600
Accumulated amortization |  | (248,600)
Other Intangible Assets [Rollforward] |  |
Other intangible assets, net, beginning balance | $ 184,043 |
Additions from new business combinations | 367,200 |
Currency translation adjustments | 300 |
Amortization expense | (54,500) |
Other intangible assets, net, ending balance | 496,963 |
Customer Relationships and Backlog |  |
Other Intangible Assets [Line Items] |  |
Other intangible assets, amortizing, gross |  | 297,900
Accumulated amortization |  | (218,500)
Other Intangible Assets [Rollforward] |  |
Other intangible assets, net, amortizing, beginning balance | 79,400 |
Additions from new business combinations, amortizing intangible assets | 311,800 |
Currency translation adjustments, amortizing intangible assets | 0 |
Amortization expense | (41,500) |
Other intangible assets, net, amortizing, ending balance | 349,700 |
Pre-Qualifications |  |
Other Intangible Assets [Line Items] |  |
Other intangible assets, amortizing, gross |  | 73,800
Accumulated amortization |  | (10,600)
Other Intangible Assets [Rollforward] |  |
Other intangible assets, net, amortizing, beginning balance | 63,200 |
Additions from new business combinations, amortizing intangible assets | 0 |
Currency translation adjustments, amortizing intangible assets | 300 |
Amortization expense | (8,400) |
Other intangible assets, net, amortizing, ending balance | 55,100 |
Other |  |
Other Intangible Assets [Line Items] |  |
Other intangible assets, amortizing, gross |  | 26,400
Accumulated amortization |  | (19,500)
Other Intangible Assets [Rollforward] |  |
Other intangible assets, net, amortizing, beginning balance | 6,900 |
Additions from new business combinations, amortizing intangible assets | 55,400 |
Currency translation adjustments, amortizing intangible assets | 0 |
Amortization expense | (4,600) |
Other intangible assets, net, amortizing, ending balance | 57,700 |
Trade Names |  |
Other Intangible Assets [Line Items] |  |
Other intangible assets, non-amortizing | 34,500 | $ 34,500
Other Intangible Assets [Rollforward] |  |
Other intangible assets, non-amortizing, beginning balance | 34,500 |
Additions from new business combinations, non-amortizing intangible assets | 0 |
Currency translation adjustments, non-amortizing intangible assets | 0 |
Other intangible assets, non-amortizing, ending balance | $ 34,500 |

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) intangible assets, excluding goodwill. + 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=123570139&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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