Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Period for credit risk identified	30 days
Sales revenues totaling	$ 17.0
Unbilled contract assets	$ 38.7	$ 37.2
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	$ 11.3	17.5
Accounts Receivable [Member]
Disaggregation Of Revenue [Line Items]
Unbilled contract assets	$ 1.4	$ 1.0