Segment Data - Disaggregated Revenues, Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 96,424	$ 202,763	$ 362,920	$ 630,648
Mats and integrated services
Disaggregation of Revenue [Line Items]
Revenues	28,713	50,216	87,742	144,904
Mats and integrated services | Service revenues
Disaggregation of Revenue [Line Items]
Revenues	13,469	18,930	40,500	59,989
Mats and integrated services | Rental revenues
Disaggregation of Revenue [Line Items]
Revenues	9,327	16,700	31,999	55,955
Mats and integrated services | Product sales revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 5,917	$ 14,586	$ 15,243	$ 28,960