XML 53 R39.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Nature of Business - Additional Information (Detail) | Dec. 31, 2017 Branches Location | Dec. 31, 2016 Branches | Dec. 31, 2015 Branches
--- | --- | --- | ---
Entity Location [Line Items] |  |  |
Number of branches | 342 |  |
Net number of branches opened | Branches | 3 | 8 | 31
Alabama [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 47 |  |
Georgia [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 8 |  |
New Mexico [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 18 |  |
North Carolina [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 37 |  |
Oklahoma [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 28 |  |
South Carolina [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 68 |  |
Tennessee [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 21 |  |
Texas [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 98 |  |
Virginia [Member] |  |  |
Entity Location [Line Items] |  |  |
Number of branches | 17 |  |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | dei_EntityLocationLineItems
Namespace Prefix: | dei_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net number of branches opened. + References No definition available. + Details
Name: | rm_NetNumberOfBranchesOpened
Namespace Prefix: | rm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_AL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_GA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_NM
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_NC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_OK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_SC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_TN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_VA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |