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Acquisitions - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Business Client_List shares | Dec. 31, 2015 USD ($) Business Client_List shares | Dec. 31, 2014 USD ($) Business Client shares
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 6 | 3 | 6
Contingent consideration, current | $ 16,322 | $ 12,855 |
Contingent consideration, non-current | 17,387 | 11,962 |
Annual revenue | 41,200 |  |
Goodwill | 487,484 | 447,685 | $ 435,231
Consideration paid in cash | $ 7,100 | $ 12,000 | $ 4,600
Number of common stock issued | shares | 400,000 | 300,000 | 100,000
Fair value of contingent consideration | $ 1,300 | $ 2,900 | $ 3,900
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, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 40,000 |  |
Consideration paid in common stock | 2,100 |  |
Contingent consideration | 21,100 |  |
Contingent arrangements arising from acquisitions | 23,500 |  |
Contingent consideration, current | 6,600 |  |
Contingent consideration, non-current | 14,500 |  |
Goodwill | 34,803 |  |
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 10,500 |
Consideration paid in common stock |  | 1,400 |
Contingent consideration |  | 8,500 |
Contingent arrangements arising from acquisitions |  | 8,700 |
Contingent consideration, current |  | 2,900 |
Contingent consideration, non-current |  | 5,600 |
Goodwill |  | 13,471 |
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, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  |  | 43,900
Consideration paid in common stock |  |  | 2,900
Contingent consideration |  |  | 19,400
Contingent arrangements arising from acquisitions |  |  | 20,900
Goodwill |  |  | 51,873
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] | Contingent Purchase Price Liability Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  |  | 5,000
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] | Contingent Purchase Price Liability Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  |  | 14,400
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 1,200 | 2,800 | 1,000
Contingent consideration | $ 1,500 | 100 | $ 200
Number of client list purchased | 7 |  | 4
Guaranteed future consideration | $ 1,200 | $ 800 |
Acquisition of Client Lists [Member] | Benefit and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | 6 | 6 | 1
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client |  |  | 3
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 1 |  |

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