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Business Combinations - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) acquisition | Mar. 31, 2017 USD ($) acquisition | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 41,204,000 |  |  |
Number of acquisitions | acquisition | 2 | 0 |  |
Aggregate purchase price of acquisitions | $ 21,400 |  |  |
Payments to Acquire Businesses, Gross | 33,576,000 |  |  |
Goodwill assigned | 31,367,000 |  |  |
Goodwill currently deductible for income tax purposes | 26,900,000 |  |  |
Goodwill related to the recorded earn-out payables | 4,500,000 |  |  |
Total revenues related to acquisitions | 900,000 |  |  |
Income before income taxes related to acquisitions | 100,000 |  |  |
Estimated acquisition earn-out payables | 40,600,000 | $ 57,408,000 | $ 36,175,000 | $ 63,821,000
Maximum Future Contingency payments Acquisitions | 84,200,000 |  |  |
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 29,100,000 |  |  |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years |  |  |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years |  |  |
Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | $ 31,356,000 |  |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 11,500,000 |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 2 |  |  |
Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 41,204,000 |  |  |
Goodwill assigned | $ 31,367,000 |  |  |

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