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Acquisitions - Allocated Aggregate Purchase Price of Acquisitions (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Funds held for clients | $ 213,457 | $ 171,497 |
Goodwill | 487,484 | 447,685 | $ 435,231
Millimaki Eggert, LLP(Millimaki), The Savitz organization (Savitz), Flex-Pay Business Services, Inc (Flex-pay), Ed Jacobs & Associates, Inc (EJ&A), 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 |  |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview), Lewis Birch & Ricardo, LLC (LBR), Tegrit Group (Tegrit), Rognstad’s Inc. d.b.a. Sattler Insurance Agency (Sattler) and Weekes & Callaway (W&C) [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 1,381
Accounts receivable, net |  |  | 4,204
Other assets |  |  | 464
Identifiable intangible assets |  |  | 17,952
Accounts payable |  |  | (3,319)
Accrued liabilities |  |  | (3,513)
Income taxes payable |  |  | (1,058)
Deferred taxes |  |  | (1,834)
Total identifiable net assets |  |  | 14,277
Goodwill |  |  | 51,873
Aggregate purchase price |  |  | $ 66,150
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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