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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |
Period for credit risk identified |  | 30 days |
Sales revenues totaling | $ 0.6 | $ 7.8 |
Lease revenue | 118.1 | 323.5 |
Operating lease revenue | 117.8 | 322.2 |
Finance lease revenue | 0.3 | 1.3 |
Finance lease revenue, sales revenue | 0.3 | 1.2 |
Finance lease revenue, interest income | 0.1 | $ 0.1 |
Period for warranties for rental equipment |  | 90 days |
Period for warranties for equipment manufactured |  | 1 year |
Deferred Income [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Customer contract liability | 27.7 | $ 27.7 | $ 11.3
Accounts Receivable [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Unbilled contract assets | $ 1.8 | $ 1.8 | $ 1.4

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