XML 59 R41.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Basis of Presentation and Significant Accounting Policies - Partnership (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 02, 2018 | Dec. 31, 2018
Decrease to partners' capital |  | $ 36,111
CDM |  |
Aggregate consideration | $ 1,700,000 |

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total change in each class of partners' capital accounts during the year due to deemed distribution for additional interest in predecessor parent company. All partners include general, limited and preferred partners. + References No definition available. + Details
Name: | usac_PartnersCapitalAccountDeemedDistributionForAdditionalInterestInPredecessorParentCompany
Namespace Prefix: | usac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=usac_CDMManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |