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Business and Basis of Presentation - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2019 Segment | Sep. 30, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Number Of Reporting Units | Segment |  | 2 |
General and Administrative Expenses [Member] |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Decreases to general and administrative expenses | $ 0.4 |  | $ 0.8
Acquisition Related Amortization and Remeasurement Expense [Member] |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Increases in acquisition related amortization and remeasurement expense | $ 0.4 |  | $ 0.8

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