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Internal-Use Software - Additional Information (Detail) - Early Adoption ASU 2018-15 [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items] |  |  |
Capitalized implementation costs net of amortizations, for software services | $ 14.2 | $ 14.2 | $ 10.6
Capitalized implementation costs during the period | $ 0.9 | $ 4.5 |
Minimum [Member] |  |  |
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items] |  |  |
Capitalized implementation costs amortization period |  | 3 years |
Maximum [Member] |  |  |
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items] |  |  |
Capitalized implementation costs amortization period |  | 10 years |

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