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Commercial Mortgage Residual Interests (Schedule of Key Assumptions Used in Determining the Value of the Residuals) (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Discount rate | 20.00%nnn_DiscountRateValuationAdjustment |  | 20.00%nnn_DiscountRateValuationAdjustment |
Loss severity of loans in foreclosure | 20.00%nnn_LossSeverityOfLoansInForeclosure |  | 20.00%nnn_LossSeverityOfLoansInForeclosure |
LIBOR | Forward 3-month curve |  | Forward 3-month curve |
Prime | Forward curve |  | Forward curve |
Minimum |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Average Life Equivalent CPR Speeds Range | 0.87%nnn_AverageLifeEquivalentCprSpeedsRange / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 0.80%nnn_AverageLifeEquivalentCprSpeedsRange / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Foreclosures Frequency Curve Default Model | 0.70%nnn_ForeclosuresFrequencyCurveDefaultModel / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.07%nnn_ForeclosuresFrequencyCurveDefaultModel / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |
Average Life Equivalent CPR Speeds Range | 26.30%nnn_AverageLifeEquivalentCprSpeedsRange / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 20.76%nnn_AverageLifeEquivalentCprSpeedsRange / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
Foreclosures Frequency Curve Default Model | 2.45%nnn_ForeclosuresFrequencyCurveDefaultModel / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 2.43%nnn_ForeclosuresFrequencyCurveDefaultModel / us-gaap_RangeAxis = us-gaap_MaximumMember |
[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 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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |