Significant Accounting Policies - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) Project	Dec. 31, 2018 USD ($) Project
Accounting Policies [Line Items]
Reclassified from selling general and administrative cost to foreign currency transaction gain loss				$ 1,600,000	$ 1,000,000.0
Inventory reserves			$ 82,149,000	71,020,000
Goodwill impairment loss	$ 7,700,000		7,700,000	0	38,600,000
Restructuring and other charges			35,380,000	4,396,000	60,043,000
Non-cash inventory write-downs			17,272,000		32,070,000
Long-lived asset write-downs			8,300,000		14,900,000
Severance costs			8,462,000	1,125,000	7,324,000
Restructuring costs			1,400,000	4,400,000	$ 5,700,000
Unbilled receivables			140,318,000	$ 140,534,000
Number of projects | Project				57	36
Percentage of total revenues				33.20%	20.50%
Percentage of product revenues				46.90%	28.00%
Leasing revenues			30,562,000	$ 39,509,000	$ 47,160,000
Gain (loss) in foreign currency exchange transactions			(1,900,000)	1,300,000	$ 800,000
Running Tools
Accounting Policies [Line Items]
Leasing revenues			28,500,000	39,000,000.0
Rental Facilities
Accounting Policies [Line Items]
Leasing revenues			2,100,000	500,000
Over Time Method
Accounting Policies [Line Items]
Unbilled receivables			96,500,000	83,200,000
Covid 19
Accounting Policies [Line Items]
Severance costs			8,400,000	0
Chief Operating Officer
Accounting Policies [Line Items]
Severance costs		$ 1,100,000
Inventories
Accounting Policies [Line Items]
Inventory reserves			$ 82,100,000	$ 71,000,000.0