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Dispositions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Total proceeds from sale of business unit, net of cash sold | $ 72,509 |  |  |  | $ 72,509 |
Pre-tax gain | $ 74,856 |  | $ 74,856 |  | 74,856 |
Net revenues |  | $ 573,140 | $ 480,757 | $ 1,127,415 | $ 917,910 |
Data Analytics Solutions Business [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net revenues |  |  |  |  |  | $ 12,700

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