v2.4.0.6

Advances and other assets consists (Parenthetical) (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012
Schedule Of Other Assets [Line Items] |
Sales type lease unearned income | 374,000
Signing bonuses to independent sales agents |
Schedule Of Other Assets [Line Items] |
Signing bonuses to independent sales agents | contracts from three to ten years
Non-interest bearing advances to independent sales |
Schedule Of Other Assets [Line Items] |
Advances repayable term | 2018
Loans to independent sales agents bearing interest |
Schedule Of Other Assets [Line Items] |
Loans receivable description of variable rate basis | prime plus 1
Loans receivable basis spread on variable rate | 1.00%
Loans repayable term | 2021
Sales-type leases |
Schedule Of Other Assets [Line Items] |
Sales type lease original term | Sales-type leases with original terms of 48 months
Sales type lease term year | 2016
Due from independent sales agents and employees |
Schedule Of Other Assets [Line Items] |
Advances repayable term | 2021

X
- Definition Advances Repayable Term. + References No definition available. + Details
Name: | auto_AdvancesRepayableTerm
Namespace Prefix: | auto_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Repayable Term. + References No definition available. + Details
Name: | auto_LoansRepayableTerm
Namespace Prefix: | auto_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sales Type Lease Original Term. + References No definition available. + Details
Name: | auto_SalesTypeLeaseOriginalTerm
Namespace Prefix: | auto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sales Type Lease Term Year. + References No definition available. + Details
Name: | auto_SalesTypeLeaseTermYear
Namespace Prefix: | auto_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sales Type Lease Unearned Income. + References No definition available. + Details
Name: | auto_SalesTypeLeaseUnearnedIncome
Namespace Prefix: | auto_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | auto_ScheduleOfOtherAssetsLineItems
Namespace Prefix: | auto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Signing bonuses to independent + References No definition available. + Details
Name: | auto_SigningBonusesToIndependent
Namespace Prefix: | auto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
Name: | us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_LoansReceivableDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration