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FacilitySource Acquisition - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 12, 2018 | Sep. 30, 2019 | Dec. 31, 2018
FacilitySource [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date of business purchase agreement |  | Jun. 12, 2018 |
Final purchase price paid in cash | $ 266.5 |  |
Purchase price payable in cash |  | $ 3.5 | $ 263.0
Blocker Corp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Blocker Units purchase from Stockholders | 1,686,013 |  |

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