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Commercial Mortgage Residual Interests Commercial Mortgage Residual Interests (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 securitizations | Mar. 31, 2012 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of securitizations | 7 |  |  |  |
Discount rate | 25.00% |  |  | 25.00% |
Loss severity of loans in foreclosure | 20.00% |  |  | 20.00% |
LIBOR | Forward 3-month curve |  |  | Forward 3-month curve |
Prime | Forward curve |  |  | Forward curve |
Unrealized gains | $ 869 |  | $ 0 |  |
Maximum [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Average life equivalent CPR speeds range | 25.04% | [1] |  | 24.31% | [1]
Foreclosures frequency curve default model | 4.76% |  |  | 4.49% |
Minimum [Member] |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Average life equivalent CPR speeds range | 0.80% | [1] |  | 0.08% | [1]
Foreclosures frequency curve default model | 0.08% |  |  | 0.09% |
[1] | Conditional prepayment rate.

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- Definition Average Life Equivalent CPR Speeds Range Assumption + References No definition available. + Details
Name: | nnn_AverageLifeEquivalentCprSpeedsRange
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Discount Rate Valuation Adjustment Assumption + References No definition available. + Details
Name: | nnn_DiscountRateValuationAdjustment
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Foreclosures Frequency Curve Default Model Assumption + References No definition available. + Details
Name: | nnn_ForeclosuresFrequencyCurveDefaultModel
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Libor Yield Assumption + References No definition available. + Details
Name: | nnn_LiborYield
Namespace Prefix: | nnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loss Severity of Loans in Foreclosure Assumption + References No definition available. + Details
Name: | nnn_LossSeverityOfLoansInForeclosure
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Securitizations + References No definition available. + Details
Name: | nnn_NumberOfSecuritizations
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Other comprehensive Income - Unrealized gain/loss on interest in financial instruments (typically securitized receivables) that continue to be held during the period. + References No definition available. + Details
Name: | nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Yield Prime Assumption + References No definition available. + Details
Name: | nnn_YieldPrime
Namespace Prefix: | nnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration