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Acquisitions - Additional Information (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) Business Client_List shares | Jun. 30, 2015 USD ($) Client_List shares | Dec. 31, 2015 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 3 |  |
Consideration paid in cash |  | $ 100 |
Contingent consideration | $ 15,100 | 3,000 |
Goodwill | 474,095 |  | $ 447,685
Guaranteed future consideration |  | 300 |
Fair value of contingent consideration | 700 | 1,500 |
Consideration paid in cash | $ 4,100 | $ 4,800 |
Number of common stock issued | shares | 220,000 | 91,000 |
Employee Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill |  | $ 6,900 |
Number of client list purchased | Client_List |  | 3 |
Contingent Purchase Price Liability Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration | $ 4,400 |  |
Contingent Purchase Price Liability Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration | 10,700 |  |
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 33,000 |  |
Consideration paid in common stock | 1,600 |  |
Contingent consideration | 15,100 |  |
Goodwill | 26,500 |  |
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member] | Employee Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | 25,500 |  |
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member] | Financial Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | 1,000 |  |
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | 26,471 |  |
Millimaki Eggert, L.L.P., (“Millimaki”), The Savitz Organization, (“Savitz”) and Flex-Pay Business Services, Inc., (“Flex-Pay”) [Member] | Employee Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill |  | $ 26,500 |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 200 |  |
Contingent consideration | $ 700 |  |
Number of client list purchased | Client_List | 3 |  |
Guaranteed future consideration | $ 1,000 |  |
Acquisition of Client Lists [Member] | Employee Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 2 |  |
Acquisition of Client Lists [Member] | Financial Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 1 |  |
Model Consulting, Inc [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 5,500 |  |
Contingent consideration | $ 4,200 |  |
Goodwill |  | $ 6,865 |

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