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Acquisitions - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) Business Client Client_List shares | Jun. 30, 2016 USD ($) Client_List shares | Dec. 31, 2016 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 3 |  |
Contingent consideration, current | $ 18,396 |  | $ 16,322
Contingent consideration, non-current | 24,830 |  | 17,387
Goodwill | 526,984 |  | $ 487,484
Fair value of contingent consideration | 800 | $ 700 |
Consideration paid in cash | $ 4,800 | $ 4,100 |
Number of common stock issued | shares | 177,000 | 220,000 |
CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 23,700 |  |
Consideration paid in common stock | 2,000 |  |
Contingent consideration | 17,500 |  |
Contingent consideration, current | 5,900 |  |
Contingent consideration, non-current | 11,600 |  |
Goodwill | $ 39,460 |  |
Pacific Coastal Pension and Insurance Services, Inc. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Feb. 01, 2017 |  |
Acquired entity, name | Pacific Coastal Pension and Insurance Services, Inc. |  |
Annual revenue | $ 1,400 |  |
Slaton Insurance [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jun. 01, 2017 |  |
Acquired entity, name | Slaton Insurance |  |
Annual revenue | $ 2,600 |  |
CMF Associates, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jun. 01, 2017 |  |
Acquired entity, name | CMF Associates, LLC |  |
Annual revenue | $ 19,200 |  |
Flex-Pay Business Services, Inc., (“Flex-Pay”), The Savitz Organization (“Savitz”) and Millimaki Eggert, L.L.P., (“Millimaki”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | $ 33,000 |
Consideration paid in common stock |  | 1,600 |
Contingent consideration |  | 15,100 |
Contingent consideration, current |  | 4,400 |
Contingent consideration, non-current |  | 10,700 |
Goodwill |  | 26,471 |
Millimaki Eggert L L P [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jan. 01, 2016 |  |
Acquired entity, name | Millimaki Eggert, L.L.P. |  |
Annual revenue | $ 2,400 |  |
Savitz Organization [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Apr. 01, 2016 |  |
Acquired entity, name | Savitz Organization |  |
Annual revenue | $ 20,000 |  |
Flex-Pay Business Services Inc [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jun. 01, 2016 |  |
Acquired entity, name | Flex-Pay Business Services, Inc. |  |
Estimated revenue | $ 10,000 |  |
Flex-Pay Business Services Inc [Member] | Minimum [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of employees covered | Client | 3,600 |  |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 200 |
Contingent consideration | $ 700 | $ 700 |
Number of client list purchased | Client_List |  | 3 |
Guaranteed future consideration |  | $ 1,000 |
Acquisition of Client Lists [Member] | Benefit And Insurance Services Practice Group |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 1 | 2 |
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List |  | 1 |
Previous Client Lists Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 400 |  |

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