CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Impact of adoption of Accounting Standard Update | ASU 2016-09	$ 1,290		$ 209			$ 1,081
Beginning balance at Dec. 31, 2016	684,928	$ 762	3,021,040	$ (1,678)	$ (73,944)	(2,227,214)	$ (34,038)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased	(2,208)				(2,208)
Cash dividends	(25,528)					(25,528)
Shares issued in employee stock purchase plan	195		195
Stock-based compensation, net of forfeitures	6,607	6	6,003				598
Stock options exercised	992	1	991
Contribution from Exterran Corporation	44,709		44,709
Net proceeds from sale of Partnership units, net of tax	49,726		17,638				32,088
Cash distribution to noncontrolling unitholders of the Partnership	(32,678)						(32,678)
Comprehensive loss
Net income (loss)	(30,732)					(28,607)	(2,125)
Derivative gain, net of reclassifications to earnings	3,890			1,614			2,276
Amortization of terminated interest rate swaps	227			227
Merger-related adjustments	0
Adjustments from other changes in ownership of Partnership	32			32
Ending balance at Sep. 30, 2017	701,450	769	3,090,785	195	(76,152)	(2,280,268)	(33,879)
Comprehensive loss
Net income (loss)	(12,683)
Derivative gain, net of reclassifications to earnings	2,076
Amortization of terminated interest rate swaps	182
Merger-related adjustments	0
Adjustments from other changes in ownership of Partnership	32
Ending balance at Sep. 30, 2017	701,450	769	3,090,785	195	(76,152)	(2,280,268)	(33,879)
Increase (Decrease) in Stockholders' Equity
Impact of adoption of Accounting Standard Update | ASU 2014-09	14,666					14,666
Impact of adoption of Accounting Standard Update | ASU 2017-12	383					383
Beginning balance at Dec. 31, 2017	735,618	769	3,093,058	1,197	(76,732)	(2,241,243)	(41,431)
Increase (Decrease) in Stockholders' Equity
Treasury stock purchased	(1,728)				(1,728)
Cash dividends	(41,132)					(41,132)
Shares issued in employee stock purchase plan	616	1	615
Stock-based compensation, net of forfeitures	5,318	10	5,372				(64)
Stock options exercised	262		262
Cash distribution to noncontrolling unitholders of the Partnership	(11,766)						(11,766)
Impact of adoption of ASU 2018-02				258		(258)
Merger-related adjustments	96,228	576	54,751				40,901
Comprehensive loss
Net income (loss)	16,192					8,095	8,097
Derivative gain, net of reclassifications to earnings	7,241			2,978			4,263
Amortization of terminated interest rate swaps	230			230
Merger-related adjustments	5,670			5,670			(5,700)
Adjustments from other changes in ownership of Partnership	0
Ending balance at Sep. 30, 2018	827,798	1,356	3,154,058	10,333	(78,460)	(2,259,489)	0
Comprehensive loss
Net income (loss)	9,974
Derivative gain, net of reclassifications to earnings	959
Amortization of terminated interest rate swaps	0
Merger-related adjustments	0
Adjustments from other changes in ownership of Partnership	0
Ending balance at Sep. 30, 2018	$ 827,798	$ 1,356	$ 3,154,058	$ 10,333	$ (78,460)	$ (2,259,489)	$ 0