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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Funds held for clients | $ 203,112 | $ 213,457 |
Goodwill | 528,424 | 487,484 | $ 447,685
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 |
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable, net |  |  | 1,501
Other assets |  |  | 52
Identifiable intangible assets |  |  | 7,037
Accounts payable |  |  | (62)
Accrued liabilities |  |  | (1,552)
Total identifiable net assets |  |  | 6,976
Goodwill |  |  | 13,471
Aggregate purchase price |  |  | $ 20,447

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