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Revenues from Contracts with Customers - Additional Information (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Stream | Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |
Net brokered margin | $ 3.1 |
Number of revenue streams | Stream | 3 |
Revenue Contract with Customer |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 257.6 | $ 305.7

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