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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 Client_List | Dec. 31, 2012 | Dec. 31, 2011 Client_List | Dec. 31, 2013 Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member] Business | Dec. 31, 2013 Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member] Current Contingent Purchase Price Liability [Member] | Dec. 31, 2013 Associated Insurance Agents (AIA), Minnesota and Knight Field Fabry LLP (Knight) [Member] Non-Current Contingent Purchase Price Liability [Member] | Dec. 31, 2011 Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member] Business | Dec. 31, 2011 Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member] Minimum [Member] | Dec. 31, 2011 Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member] Maximum [Member] | Dec. 31, 2011 Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member] Other Current Liabilities [Member] | Dec. 31, 2011 Thompson Dunavant PLC, Multiple Benefit Services, Inc. (MBS), Gresham Smith LLC and Atlantic MDR, LLC (d/b/a Advantage Benefit Planning) (ABP) [Member] Other Non-current Liabilities [Member] | Dec. 31, 2012 Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] Business | Dec. 31, 2012 Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] Other Current Liabilities [Member] | Dec. 31, 2012 Meridian Insurance Group, LLC (Meridian), Primarily Care, Inc. (PCI) Stoltz and Company, LTD., L.L.P (Stoltz), Trinity Risk Advisors, Inc.(Trinity), Strategic Employee Benefit Services-The Pruett Group, Inc. (SEBS-Pruett), ProMedical, Inc. (ProMedical), the employee benefit division of Leavitt Pacific Insurance Brokers, Inc. (Leavitt), Diversified Industries, Inc. d/b/a Payroll Control Systems (PCS) and PHBV Partners, L.L.P. (PHBV) [Member] Other Non-current Liabilities [Member] | Feb. 01, 2012 Client lists [Member] | Dec. 31, 2013 Client lists [Member] | Dec. 31, 2011 Client lists [Member] | Dec. 31, 2013 Employee Services [Member] Client_List | Dec. 31, 2013 Financial Services Practice Group [Member] Client_List
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired |  |  |  | 2 |  |  | 4 |  |  |  |  | 8 |  |  |  |  |  |  |
Aggregate consideration paid |  |  |  | $ 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid in cash | 10,100,000 | 25,600,000 | 16,700,000 | 4,900,000 |  |  | 11,800,000 |  |  |  |  | 74,200,000 |  |  | 2,500,000 | 300,000 | 800,000 |  |
Guaranteed future consideration |  |  |  | 400,000 |  |  | 1,100,000 |  |  |  |  | 1,700,000 |  |  |  |  |  |  |
CBIZ contingent consideration |  |  |  | 5,500,000 |  |  | 13,400,000 |  |  |  |  | 15,400,000 |  |  |  | 300,000 | 600,000 |  |
Contingent arrangements arising from acquisitions |  |  |  | 6,100,000 |  |  |  |  |  |  |  | 18,500,000 |  |  |  |  |  |  |
Contingent liability | 2,200,000 |  |  | 5,500,000 | 1,200,000 | 4,300,000 | 13,400,000 |  |  | 4,100,000 | 9,300,000 | 15,400,000 | 4,600,000 | 10,800,000 |  |  |  |  |
Goodwill | 384,697,000 | 375,122,000 | 317,434,000 | 9,278,000 |  |  | 16,869,000 |  |  |  |  | 57,190,000 |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  | 1,400,000 |  |  | 11,800,000 |  |  |  |  | 53,000,000 |  |  |  |  |  |  |
Number of client list purchased | 3 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 1
Number of common stock issued | 184,000 | 402,000 | 38,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration | 1,100,000 | 1,100,000 | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, revenue recorded |  |  |  |  |  |  |  |  |  |  |  | 25,400,000 |  |  |  |  |  |  |
Consideration paid in common stock |  |  |  |  |  |  | 3,300,000 |  |  |  |  | 3,600,000 |  |  |  |  |  |  |
Short-term notes payable |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |
Common stock issuable |  | 41,314 | 251,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Consideration of Acquisitions |  |  |  |  |  |  | 29,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent arrangements arising from acquisitions |  |  |  |  |  |  |  | 0 | 15,100,000 |  |  |  |  |  |  |  |  |  |
Goodwill purchase price adjustments |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in the value of goodwill |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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