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Acquisitions (Second Quarter 2016) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Client
Savitz Organization [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Effective date of acquisition | Apr. 01, 2016
Acquired entity, name | Savitz Organization
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
Flex-Pay Business Services Inc [Member] | Minimum [Member] |
Business Acquisition, Contingent Consideration [Line Items] |
Number of employees covered | 3,600

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