Summary of Significant Accounting Policies and Other Information - Narrative (Details)		1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 02, 2020 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) board_member reporting_unit segment	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Number of board members | board_member					3
Number of operating segments | segment					1
Research and development and engineering expenses					$ 23,300,000	$ 26,800,000
Insurance recoveries					3,600,000	16,000,000
Asset impairment charges				$ 2,234,000	$ 1,000	2,234,000
Number of reporting units | reporting_unit					2
Impairment losses					$ 0	0
Changes in estimates for preexisting warranties			$ 2,700,000		$ 2,730,000	$ 3,842,000
Minimum
Concentration Risk [Line Items]
Amortization period					3 years
Maximum
Concentration Risk [Line Items]
Amortization period					15 years
Revolving Credit Facility
Concentration Risk [Line Items]
Maturity period prior to the final maturity					60 days
Share Purchase Agreement, Weichai Transaction
Concentration Risk [Line Items]
Consideration received on transaction		$ 60,000,000
Subsequent Event | Standard Chartered Bank Credit Agreement | Revolving Credit Facility
Concentration Risk [Line Items]
Maximum borrowing capacity	$ 130,000,000
Maturity period prior to the final maturity	60 days
Extension fee	0.25%