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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 | Nov. 15, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred |  |  | $ 102,300 | $ 94,200
Business acquisition, contingent cash consideration |  |  |  | 18,000
Additional goodwill recognized |  |  | 55,872 | $ 39,700
Measurement period adjustments |  |  | $ 1,100 |
Poten & Partners Group [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition date |  | Nov. 15, 2018 |  |
Ed Broking Group Limited [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition date | Jan. 31, 2019 |  |  |

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