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Goodwill and Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Asset Impairment Charges [Abstract] |  |  |
Goodwill | $ 464,392 | $ 332,447 | $ 235,182
Impairment testing, Scenario one |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment testing, discounted cash flow analysis weightage assigned |  | 50.00% |
Impairment testing, Scenario two |  |  |
Asset Impairment Charges [Abstract] |  |  |
Impairment testing, public company approach weightage assigned |  | 50.00% |
Walker |  |  |
Asset Impairment Charges [Abstract] |  |  |
Percentage of fair values in excess of carrying value of two acquired reporting units |  | 27.00% |
Percentage of fair values in excess of carrying value for Walker reporting unit | 24.00% |  |
Goodwill | $ 96,800 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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