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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Funds held for clients | $ 161,289 | $ 203,112 |
Goodwill | 564,300 | 528,424 | $ 487,484
Laurus Transaction Advisors, LLC. (“Laurus”), InR Advisory Services, LLC (“InR”) and Sequoia Financial Group, LLC. (“Sequoia”) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 306 |  |
Accounts receivable, net | 1,958 |  |
Other assets | 12 |  |
Identifiable intangible assets | 5,539 |  |
Accrued liabilities | (1,753) |  |
Total identifiable net assets | 6,062 |  |
Goodwill | 36,054 |  |
Aggregate purchase price | $ 42,116 |  |
Pacific Coastal Pension and Insurance Services, Inc. ("Pacific Coastal"), CMF Associates, LLC ("CMF"), Slaton Insurance ("Slaton") and McKay & Carnahan, Inc. ("McKay") [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  | 843 |
Accounts receivable, net |  | 4,338 |
Property and equipment |  | 48 |
Other assets |  | 221 |
Identifiable intangible assets |  | 4,229 |
Accounts payable |  | (1,283) |
Accrued liabilities |  | (3,503) |
Total identifiable net assets |  | 4,893 |
Goodwill |  | 40,587 |
Aggregate purchase price |  | $ 45,480 |
Millimaki Eggert, LLP(Millimaki), The Savitz organization (Savitz), Flex-Pay Business Services, Inc (Flex-pay), Ed Jacobs & Associates, Inc (Ed Jacobs), Actuarial Consultants, Inc (ACT), The Seff Group,P.C (Seff) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 10
Accounts receivable, net |  |  | 6,649
Funds held for clients |  |  | 37,230
Property and equipment |  |  | 440
Other assets |  |  | 294
Identifiable intangible assets |  |  | 22,177
Accrued liabilities |  |  | (1,133)
Client fund obligations |  |  | (37,230)
Total identifiable net assets |  |  | 28,437
Goodwill |  |  | 34,803
Aggregate purchase price |  |  | $ 63,240

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