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v3.3.1.900

Acquisitions - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Client_List shares | Dec. 31, 2014 USD ($) Client_List shares | Dec. 31, 2013 USD ($) Client_List Business shares
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 447,685 | $ 435,231 | $ 384,697
Consideration paid in cash | $ 12,000 | $ 4,600 | $ 10,100
Number of common stock issued | shares | 300,000 | 100,000 | 200,000
Fair value of contingent consideration | $ 2,900 | $ 3,900 | $ 1,100
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 |  |
Goodwill | 13,471 |  |
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] | Contingent Purchase Price Liability Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration | 2,900 |  |
Model Consulting, Inc. (Model),Pension Resource Group, Inc. (PRG),Cottonwood Group, Inc. (Cottonwood)[Member] | Contingent Purchase Price Liability Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration | 5,600 |  |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  | 19,400 |
Contingent arrangements arising from acquisitions |  | 20,900 |
Goodwill |  | 51,873 |
Centric Insurance Agency (Centric), Clearview National Partners, LLC (Clearview),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [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),Tegrit Group(Tegrit), Sattler Insurance Agency (Sattler) and Lewis Birch & Richardo, LLC (LBR) [Member] | Contingent Purchase Price Liability Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  | 14,400 |
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  |  | 4,900
Contingent consideration |  |  | 5,500
Contingent arrangements arising from acquisitions |  |  | 6,100
Goodwill |  |  | 9,278
Guaranteed future consideration |  |  | $ 400
Number of businesses acquired | Business |  |  | 2
CBIZ contingent consideration |  |  | $ 5,500
Goodwill deductible for tax purposes |  |  | 1,400
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  |  | 1,200
Associated Insurance Agents (AIA), Minneapolis, Minnesota and Knight Field Fabry LLP (Knight) [Member] | Contingent Purchase Price Liability Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  |  | 4,300
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 2,800 | 1,000 | 300
Contingent consideration | 100 | $ 200 | $ 300
Number of client list purchased | Client_List |  | 4 | 3
Guaranteed future consideration | $ 800 |  |
Lewis Birch & Richardo, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | $ 43,900 |
Consideration paid in common stock |  | 2,900 |
Contingent consideration |  | $ 19,400 |
Employee Services [Member] | Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 6 | 1 | 2
Financial Services Practice Group [Member] | Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List |  | 3 | 1

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