Segment Data - Disaggregated Revenues, Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 236,262	$ 183,020	$ 463,555	$ 341,711
Operating segments | Fluids systems
Disaggregation of Revenue [Line Items]
Revenues	179,738	150,623	357,117	286,673
Operating segments | Fluids systems | Western Hemisphere
Disaggregation of Revenue [Line Items]
Revenues	124,521	104,238	247,976	198,573
Operating segments | Fluids systems | North America
Disaggregation of Revenue [Line Items]
Revenues	115,618	95,640	231,159	180,915
Operating segments | Fluids systems | United States
Disaggregation of Revenue [Line Items]
Revenues	104,333	88,206	196,802	153,826
Operating segments | Fluids systems | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,285	7,434	34,357	27,089
Operating segments | Fluids systems | Latin America
Disaggregation of Revenue [Line Items]
Revenues	8,903	8,598	16,817	17,658
Operating segments | Fluids systems | Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Revenues	55,217	46,385	109,141	88,100
Operating segments | Fluids systems | EMEA
Disaggregation of Revenue [Line Items]
Revenues	49,546	44,788	100,981	85,296
Operating segments | Fluids systems | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	$ 5,671	$ 1,597	$ 8,160	$ 2,804