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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Period for credit risk identified |  | 30 days |
Sales revenues totaling | $ 5.7 | $ 8.5 |
Lease revenue | 97.9 | 200.1 |
Operating lease revenue | 97.2 | 198.9 |
Finance lease revenue | 0.7 | 1.2 |
Finance lease revenue, sales revenue |  | 1.0 |
Finance lease revenue, interest income |  | $ 0.2 |
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 | 29.5 | $ 29.5 | $ 17.5
Accounts Receivable [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Unbilled contract assets | $ 1.2 | $ 1.2 | $ 1.0

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