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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 566,009 | $ 564,300 |
Wenner Group, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable, net | 550 |  |
Identifiable intangible assets | 654 |  |
Other current assets | 5 |  |
Current liabilities | (288) |  |
Total identifiable net assets | 921 |  |
Goodwill | 2,165 |  |
Aggregate purchase price | $ 3,086 |  |
Laurus Transaction Advisors, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable, net |  |  | $ 1,255
Identifiable intangible assets |  |  | 457
Current liabilities |  |  | (805)
Total identifiable net assets |  |  | 907
Goodwill |  |  | 22,943
Aggregate purchase price |  |  | $ 23,850

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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