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Long-Term Debt - Partnership Credit Facility (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 26, 2018 | Mar. 30, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 3,332,000 | $ 14,855,000 | $ 2,395,000
Repayments of long-term debt |  |  |  |  |  |  |  |  |  |  | 605,636,000 | 1,270,194,000 | 675,000,000
Debt extinguishment loss |  |  | $ 0 | $ 0 | $ 2,450,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 291,000 | 2,450,000 | 291,000 | 0
Revolving Credit Facility | Archrock Partners, L.P |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn capacity under revolving credit facility |  |  | 395,300,000 |  |  |  |  |  |  |  | 395,300,000 |  |
Revolving Credit Facility | Revolving Credit Facility Due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.00% |  |  |  |  |  |  |  |  |  |  |
Payments for debt issuance costs |  | $ 14,900,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost written off |  |  |  |  |  |  |  |  |  |  |  |  | 400,000
Maximum borrowing capacity | $ 1,250,000,000.00 |  |  |  |  | 1,100,000,000.0 |  |  |  |  |  |  |
Debt issuance costs | 3,300,000 |  |  |  |  |  |  |  |  |  |  |  | 1,700,000
Change in borrowing capacity |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |
Commitment fee amount |  |  |  |  |  |  |  |  |  |  | 2,100,000 | $ 2,100,000 | 1,400,000
Maximum consolidated cash balance |  |  | 50,000,000.0 |  |  |  |  |  |  |  | 50,000,000.0 |  |
Line of credit outstanding |  |  | 15,200,000 |  |  |  |  |  |  |  | $ 15,200,000 |  |
Revolving Credit Facility | Revolving Credit Facility Due March 2022 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee (percentage) |  |  |  |  |  |  |  |  |  |  | 0.375% |  |
Revolving Credit Facility | Revolving Credit Facility Due March 2022 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee (percentage) |  |  |  |  |  |  |  |  |  |  | 0.50% |  |
Undrawn capacity under revolving credit facility |  |  | $ 391,600,000 |  |  |  |  |  |  |  | $ 391,600,000 |  |
Revolving Credit Facility | Revolving Credit Facility Due March 2022 | Swing Line |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Change in borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Revolving Credit Facility | Partnership former credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | 648,400,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost written off |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Commitment fee amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000
Revolving Credit Facility | Term Loan Facility Due May2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Revolving Credit Facility Due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate |  |  |  |  |  |  |  |  |  |  | 2.70% |  |
Weighted average interest rate |  |  | 5.40% |  |  |  | 4.80% |  |  |  | 5.40% | 4.80% |
Line of Credit | Revolving Credit Facility Due March 2022 | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest margin added to variable rate |  |  |  |  |  |  |  |  |  |  | 0.50% |  |
Line of Credit | Revolving Credit Facility Due March 2022 | One-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest margin added to variable rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Line of Credit | Revolving Credit Facility Due March 2022 | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Line of Credit | Revolving Credit Facility Due March 2022 | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Line of Credit | Revolving Credit Facility Due March 2022 | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Line of Credit | Revolving Credit Facility Due March 2022 | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable rate |  |  |  |  |  |  |  |  |  |  | 2.25% |  |

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