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Acquisitions - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Business Client shares | Dec. 31, 2016 USD ($) Business Client_List shares | Dec. 31, 2015 USD ($) Business Client_List shares
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 4 | 6 | 3
Contingent consideration, current | $ 15,151 | $ 16,322 |
Contingent consideration, non-current | 22,423 | 17,387 |
Annual revenue | 25,700 | 41,200 | $ 12,100
Goodwill | 528,424 | 487,484 | 447,685
Consideration paid in cash | $ 9,800 | $ 7,100 | $ 12,000
Number of common stock issued | shares | 300,000 | 400,000 | 300,000
Changes in fair value of contingent consideration | $ 1,500 | $ 1,300 | $ 2,900
Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal), CMF Associates, LLC (CMF), Slaton Insurance (Slaton) and McKay & Carnahan, Inc. (McKay) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 24,200 |  |
Consideration paid in common stock | 2,000 |  |
Contingent consideration | 19,300 |  |
Contingent arrangements arising from acquisitions | 20,300 |  |
Fair value of obligation at acquisition date | 19,300 |  |
Contingent consideration, current | 6,300 |  |
Contingent consideration, non-current | 13,000 |  |
Goodwill | 40,587 |  |
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, 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
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 1,200 | 2,800
Contingent consideration | $ 1,400 | $ 1,500 | 100
Number of client list purchased | 2 | 7 |
Guaranteed future consideration |  | $ 1,200 | $ 800
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List |  | 1 |
Acquisition of Client Lists [Member] | Maximum [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 100 |  |
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client | 1 |  |
Acquisition of Client Lists [Member] | Benefit and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | 1 | 6 | 6

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