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Goodwill and Identifiable Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2018
Goodwill |  |  |
Goodwill | $ 332,447 | $ 420,782 | $ 235,182
Walker |  |  |
Goodwill |  |  |
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 | 27.00% | 29.00% |
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://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=77989000&loc=SL49117168-202975 Reference 2: 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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