Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Entities [Table] Entities [Table] Entities [Table] Document Information [Line Items] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Document Type Amendment Flag Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Filer Category Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets Assets Real Estate Investment Property Net [Abstract] Rental property, at cost: Rental property, at cost: Land Land Land Investment Building and Building Improvements Buildings Buildings Tenant Improvements Tenant-in-common property Tenant-in-common property Real Estate Investment Property At Cost Real Estate Investment Property, at Cost, Total Real Estate Investment Property, at Cost, Total Real Estate Investment Property Accumulated Depreciation Less: accumulated depreciation Less: accumulated depreciation Real Estate Investment Property Net Rental property, net Rental property, net Cash and Cash Equivalents At Carrying Value Cash and cash equivalents Cash and cash equivalents Beginning of period End of period Restricted Cash and Cash Equivalents Restricted cash Restricted cash Available For Sale Securities Investment securities available for sale, at market Investment securities available for sale, at market Accounts and Notes Receivable Net Tenant accounts receivable, net of allowance of $30 as of September 30, 2012 and December 31, 2011, respectively Tenant accounts receivable, net of allowance of $30 as of September 30, 2012 and December 31, 2011, respectively Unbilled Contracts Receivable Unbilled rent receivable Unbilled rent receivable Other Assets Other assets, net (1) Accounts receivable and other assets, net (1) Assets Total assets Total assets Liabilities and Stockholders Equity [Abstract] Liabilities and Partners' Deficit Liabilities and Partners' Deficit Debt Instrument Carrying Amount Wraparound mortgages payable (1) Wraparound mortgages payable (1) Debt Instrument Unamortized Discount Premium Net Less: unamortized discount based on imputed interest rate of 12% (1) Less: unamortized discount based on imputed interest rate of 12% (1) Long Term Debt Wraparound mortgages payable less unamortized discount (1) Wraparound mortgages payable less unamortized discount (1) Due To Related Parties Current and Noncurrent Due to NPAEP (1) Due to related party Other Borrowings Other borrowings (1) Other borrowings (1) Accounts Payable and Other Accrued Liabilities Accounts payable and other liabilities (1) Accounts payable and other liabilities (1) Deferred Revenue Deferred revenue Deferred revenue balance Capital Lease Obligations Finance lease obligation Finance lease obligation Liabilities Total liabilities Total liabilities Partners Capital Partners' deficit: Partners' deficit Beginning of period End of period Liabilities and Stockholders Equity Total liabilities and partners' deficit Total liabilities and partners' deficit Allowance For Doubtful Accounts Premiums and Other Receivables Tenant accounts receivable, allowance Tenant accounts receivable, allowance Debt Instrument Interest Rate At Period End Unamortized discount, imputed interest rate Unamortized discount, imputed interest rate Income Statement [Abstract] Income Statement [Abstract] Income Statement [Abstract] Revenues [Abstract] Income: Revenues [Abstract] Operating Leases Income Statement Lease Revenue Recognized revenue Rental income Tenant Reimbursements Other charges to tenants Other charges to tenants Investment Income Interest and Dividend Interest and dividend income Interest and dividend income Revenues Total income Total income Costs and Expenses [Abstract] Operating expenses: Operating expenses: Interest Expense Interest expense (1) Interest expense (1) Real Estate Tax Expense Real estate taxes Real estate taxes Asset Management Costs Management fees (1) Management fees (1) Maintenance Costs Common area maintenance expenses Common area maintenance expenses Lease and Rental Expense Ground rent (1) Ground rent (1) Cost Of Property Repairs and Maintenance Repairs and maintenance Repairs and maintenance General and Administrative Expense General and administrative (1) General and administrative (1) Depreciation Depreciation Depreciation Amortization Of Intangible Assets Amortization Amortization Costs and Expenses Total operating expenses Total operating expenses Operating Income Loss Operating loss Operating loss Nonoperating Income Expense [Abstract] Other gain (loss): Other gain (loss): Marketable Securities Realized Gain Loss Realized gains on investment securities Realized gains on investment securities Realized gains on investment securities Income Loss From Continuing Operations Loss from continuing operations Loss from continuing operations Income Loss From Discontinued Operations Net Of Tax [Abstract] Discontinued operations: Discontinued operations: Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Loss from operations of discontinued components including gain from disposition of property of $356 for the nine months ended September 30, 2012 Loss from operations of discontinued components including gain from disposition of property of $356 for the nine months ended September 30, 2012 Net Income Loss Net loss Net loss Net loss Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income (loss): Other comprehensive income (loss): Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Net change in unrealized gains on investment securities Net change in unrealized gains on investment securities Comprehensive Income Net Of Tax Comprehensive loss Comprehensive loss Partners Capital [Abstract] Partners' deficit: Partners' deficit: Income Loss From Continuing Operations Per Basic and Diluted Share Loss per unit from continuing operations Loss per unit from continuing operations Income Loss From Discontinued Operations Net Of Tax Per Basic and Diluted Share Loss per unit from discontinued operations Loss per unit from discontinued operations Net Income Loss Per Outstanding Limited Partnership Unit Net loss per unit Net loss per unit Weighted Average Limited Partnership Units Outstanding Weighted average units outstanding Weighted average units outstanding Gain Loss On Disposition Of Assets Loss from operations of discontinued components, gain on disposition of property Loss from operations of discontinued components, gain on disposition of property Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By Used In Operating Activities [Abstract] Cash flows from operating activities: Cash flows from operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to reconcile net loss to net cash provided by operating activities: Depreciation Depletion and Amortization Depreciation and amortization Depreciation and amortization Amortization Of Debt Discount Premium Amortization of discount (1) Amortization of discount (1) Impairment Of Leasehold Impairment of rental property Impairment of rental property Gain Loss On Sale Of Properties Net gain on disposition of properties Net gain on disposition of properties Increase Decrease In Operating Capital [Abstract] Change in assets and liabilities Change in assets and liabilities Increase Decrease In Accounts Receivable (Increase) decrease in tenant accounts receivable (Increase) decrease in tenant accounts receivable Increase Decrease In Unbilled Receivables Decrease in unbilled rent receivable Decrease in unbilled rent receivable Increase Decrease In Accounts Payable and Other Operating Liabilities Increase in accounts payable and other liabilities (1) Increase in accounts payable and other liabilities (1) Increase Decrease In Deferred Revenue Increase (decrease) in deferred revenue Increase (decrease) in deferred revenue Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided By Used In Investing Activities [Abstract] Cash flows from investing activities: Cash flows from investing activities: Proceeds From Sale Of Productive Assets Proceeds from disposition of properties Proceeds from disposition of properties Payments For Capital Improvements Improvements to rental property Improvements to rental property Increase Decrease In Restricted Cash (Increase) decrease in restricted cash Decrease (increase) in restricted cash Payments To Acquire Marketable Securities Purchases of investment securities Purchases of investment securities Proceeds From Sale Maturity and Collections Of Investments Sales of investment securities Sales of investment securities Net Cash Provided By Used In Investing Activities Net cash provided by investing activities Net cash provided by investing activities Net Cash Provided By Used In Financing Activities [Abstract] Cash flows from financing activities: Cash flows from financing activities: Repayments Of Long Term Debt Payments on wraparound mortgages (1) Payments on wraparound mortgages (1) Debt Instrument, Increase (Decrease), Other, Net Increase in other borrowings Increase in other borrowings Proceeds From Related Party Debt Increase in due to NPAEP Increase in due to NPAEP Net Cash Provided By Used In Financing Activities Net cash used in financing activities Net cash used in financing activities Cash and Cash Equivalents Period Increase Decrease Increase in cash and cash equivalents Increase (decrease) in cash and cash equivalents Cash and Cash Equivalents At Carrying Value [Abstract] Cash and cash equivalents: Cash and cash equivalents: Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Supplemental disclosure of cash flow information: Interest Paid Cash paid during the period for interest Cash paid during the period for interest Cash Flow Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental disclosure of non-cash investing and financing activities: Supplemental disclosure of non-cash investing and financing activities: Transfer Mortgage Payable Reduction of wraparound mortgages related to disposition of property Reduction of wraparound mortgages related to disposition of property Supplemental Noncash Transactions Reduction in finance lease obligation related to disposition of property Reduction in finance lease obligation related to disposition of property Other non-cash transactions for the period not otherwise defined shall be provided in supplemental disclosures to the statement of cash flow. Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Basis Of Accounting Basis of Presentation Basis of Presentation Business Combination, Description [Abstract] Business Combination, Description [Abstract] Business Combination, Description [Abstract] Nature Of Operations Formation and Description of Business Formation and Description of Business Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Related Party Transactions Major Tenants [Abstract] Major Tenants [Abstract] Major Tenants [Abstract] Segment Reporting Disclosure [Text Block] Major Tenants Major Tenants Future Interest Agreement [Abstract] Future Interest Agreement [Abstract] Future Interest Agreement [Abstract] Management Agreement [Text Block] Future Interest Agreement Future Interest Agreement This element captures specific management and other agreements including any negotiated amendments. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disposition Of Property [Abstract] Disposition Of Property [Abstract] Disposition Of Property [Abstract] Acquisitions and Dispositions [Text Block] Disposition of Property Disposition of Property Acquisitions and Dispositions [Text Block] Deferred Revenue [Abstract] Deferred Revenue [Abstract] Deferred Revenue [Abstract] Deferred Revenue Disclosure [Text Block] Deferred Revenue Deferred Revenue Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Financial Instruments Disclosure [Text Block] Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Fair Value Measurements Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Comprehensive Income Note [Text Block] Comprehensive Income (Loss) Comprehensive Income (Loss) Gain (Loss) Related To Litigation Settlement [Abstract] Gain (Loss) Related to Litigation Settlement [Abstract] Gain (Loss) Related to Litigation Settlement [Abstract] Litigation Settlements Disclosure [Text Block] Litigation Settlement Litigation Settlement Litigation Settlements Disclosure Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Text Block] Recent Accounting Pronouncements Recent Accounting Pronouncements Schedule Of Revenue By Major Customers By Reporting Segments Table [Text Block] Number of Locations, Gross Leasable Area and Percentage of Minimum Rent for Major Tenants Number of Locations, Gross Leasable Area and Percentage of Minimum Rent for Major Tenants Fair Value Assets Measured On Recurring Basis [Text Block] Fair Value Measurements on a Recurring Basis Fair Value Measurements on a Recurring Basis Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Change in Components of Accumulated Other Comprehensive Income (Loss) Change in Components of Accumulated Other Comprehensive Income (Loss) Disclosure Formation and Description Of Business Additional Information [Abstract] Disclosure - Formation and Description of Business - Additional Information [Abstract] Disclosure - Formation and Description of Business - Additional Information [Abstract] Disclosure - Formation and Description of Business - Additional Information [Abstract] Schedule Of Limited Partners Capital Account By Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Limited Partners Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Limited Liability Company L L C Or Limited Partnership L P Members Or Limited Partners Ownership Interest Portion of NPAMLP owned by limited partners Portion of NPAMLP owned by limited partners Limited Liability Company L L C Or Limited Partnership L P Managing Member Or General Partner Ownership Interest Portion of NPAMLP owned by managing general and equity partners Portion of NPAMLP owned by managing general and equity partners Limited Liability Company Or Limited Partnership Business Formation Date Limited Partnership, Business, Formation Date Limited Partnership, Business, Formation Date Disclosure Related Party Transactions Additional Information [Abstract] Disclosure - Related Party Transactions - Additional Information [Abstract] Disclosure - Related Party Transactions - Additional Information [Abstract] Disclosure - Related Party Transactions - Additional Information [Abstract] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accounts Payable and Other Liabilities [Member] Accounts Payable And Other Liabilities Accounts Payable And Other Liabilities Related Party Transactions By Related Party [Axis] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party [Domain] Group One [Member] First Parcel Group One [Member] Group Two [Member] Second Parcel Group Two [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Percentage Of Total Debt Percentage of outstanding Wraparound mortgages payable owned by NPAEP Percentage of outstanding Wraparound mortgages payable owned by NPAEP Percentage of Total Debt Line Of Credit Facility Maximum Borrowing Capacity Maximum borrowing capacity Maximum borrowing capacity Line Of Credit Facility Interest Rate At Period End Variable rate of interest on prime rate Variable rate of interest on prime rate Line Of Credit Expiration Date Line of credit facility, expiration date Line of credit facility, expiration date Line Of Credit Expiration Date Line Of Credit Facility Amount Outstanding Line of credit facility, amount outstanding Line of credit facility, amount outstanding Interest Payable Current and Noncurrent Accrued interest Accrued interest Rent Payable Annual rental payments to NPAEP Annual rental payments to NPAEP Rent Payables Disclosure Major Tenants Additional Information [Abstract] Disclosure - Major Tenants - Additional Information [Abstract] Disclosure - Major Tenants - Additional Information [Abstract] Disclosure - Major Tenants - Additional Information [Abstract] Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Major Customers [Axis] Major Customers [Axis] Major Customers [Axis] Name Of Major Customer [Domain] Name of Major Customer [Domain] Name of Major Customer [Domain] Customer B [Member] Sears Customer B [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Capital Leases Future Minimum Payments Receivable Outstanding rent Outstanding rent Number Of Locations Number of locations Number of locations Number of Locations Disclosure Number Of Locations Gross Leasable Area and Percentage Of Minimum Rent For Major Tenants [Abstract] Disclosure - Number of Locations, Gross Leasable Area and Percentage of Minimum Rent for Major Tenants [Abstract] Disclosure - Number of Locations, Gross Leasable Area and Percentage of Minimum Rent for Major Tenants [Abstract] Disclosure - Number of Locations, Gross Leasable Area and Percentage of Minimum Rent for Major Tenants [Abstract] Schedule Of Entity Wide Revenue By Major Customers By Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer [Member] Sun Microsystems Customer A [Member] Customer C [Member] CVS Customer C [Member] Entity Wide Revenue Major Customer [Line Items] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Number Of Location Number of locations Number of locations Number of Location Area Of Real Estate Property GLA GLA Percentage Of Minimum Rent % of Minimum Rent % of Minimum Rent Percentage of Minimum Rent Disclosure Future Interest Agreement Additional Information [Abstract] Disclosure - Future Interest Agreement - Additional Information [Abstract] Disclosure - Future Interest Agreement - Additional Information [Abstract] Disclosure - Future Interest Agreement - Additional Information [Abstract] Financial Instruments Owned and Pledged As Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Two Thousand Three Agreement [Member] The 2003 Agreement Two Thousand Three Agreement [Member] Statement Scenario [Axis] Scenario [Axis] Scenario [Axis] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario Forecast [Member] Scenario, Forecast Financial Instruments Owned and Pledged As Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Debt Instrument Description Debt agreement Debt agreement Debt Instrument Interest Rate Effective Percentage Annual interest rate payable on any NPAEP Wrap Note or PVPG Wrap Note Annual interest rate payable on any NPAEP Wrap Note or PVPG Wrap Note Effective Date Effective date Effective date of agreement between NPAMLP, NPAEP and Penn Valley Pension Group ("PVPG") Effective Date Debt Instrument Maturity Date Debt, maturity date Debt, maturity date Mortgage Loans On Real Estate Periodic Payment Terms Balloon Payment Amount Projected balance due for all of the Wrap Mortgages at December 31, 2013 Projected balance due for all of the Wrap Mortgages at December 31, 2013 Mortgage Notes Payable Scheduled Principal Repayments 2012 Remainder mortgage principal requirements 2012 Remainder mortgage principal requirements Mortgage Notes Payable Scheduled Principal Repayments Disclosure Commitments and Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Type Of Arrangement [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements and Nonarrangement Transactions [Member] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Land Improvements [Member] Land Improvements Lease Agreements [Member] Lease Agreements First Amendment [Member] First Amendment First Amendment [Member] Second Amendment [Member] Second Amendment Second Amendment [Member] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Consideration For Assignment Would Received Commitment to lease property, total lease consideration for the assignment would be received by anchor tenant Commitment to lease property, total lease consideration for the assignment would be received by anchor tenant Consideration for Assignment Would Received Consideration For Assignment Remitted Commitment to lease property, lease consideration remitted to anchor tenant by ARJAX , to date Commitment to lease property, lease consideration remitted to anchor tenant by ARJAX , to date Consideration for Assignment Remitted Payments For Leasing Costs Commissions and Tenant Improvements Obligation for repairs or improvements Obligation for repairs or improvements Contractual Obligation Capital commitments obligation of NPAMLP Capital commitments obligation of NPAMLP Disclosure Disposition Of Property Additional Information [Abstract] Disclosure - Disposition of Property - Additional Information [Abstract] Disclosure - Disposition of Property - Additional Information [Abstract] Disclosure - Disposition of Property - Additional Information [Abstract] Schedule Of Assets Disposed Of By Method Other Than Sale In Period Of Disposition [Table] Schedule of Assets Disposed of by Method Other than Sale, in Period of Disposition [Table] Schedule of Assets Disposed of by Method Other than Sale, in Period of Disposition [Table] Leases Commenced [Axis] Leases Commenced [Axis] Leases Commenced [Axis] Leases Commenced [Axis] Leases Commenced [Domain] Leases Commenced [Domain] Leases Commenced [Domain] Leases Commenced [Domain] Lease Termination [Member] Lease Termination Lease Termination [Member] Assets Disposed Of By Method Other Than Sale In Period Of Disposition [Line Items] Assets Disposed of by Method Other than Sale, in Period of Disposition [Line Items] Assets Disposed of by Method Other than Sale, in Period of Disposition [Line Items] Aggregate Indebtedness Underlying indebtedness amount Underlying indebtedness amount Participating Mortgage Loans Mortgage Obligations Amount Lease obligation relieved amount Lease obligation relieved amount Book Value Of Property Plant and Equipment Sold Or Disposed Net book value of the property Net book value of the property Book Value of Property Plant and Equipment Sold or Disposed Gain Loss On Disposition Of Property Gain (Loss) from the disposition of property Gain from the disposition of property Lease Termination Date Lease Termination Agreement expiration date Lease Termination Agreement expiration date Lease Termination Date Leasehold Improvements Costs Reimbursed By Landlord Reimbursement of property improvement costs Reimbursement of property improvement costs Leasehold Improvements Costs, Reimbursed by Landlord Mortgage Loans On Real Estate Balance of wraparound mortgage indebtedness, net of discounts Balance of wraparound mortgage indebtedness, net of discounts Disclosure Deferred Revenue Additional Information [Abstract] Disclosure - Deferred Revenue - Additional information [Abstract] Disclosure - Deferred Revenue - Additional information [Abstract] Disclosure - Deferred Revenue - Additional information [Abstract] Deferred Revenue Arrangement By Type [Table] Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Defined Benefit Plan By Plan Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Mortgage Loans On Real Estate Other Deductions Decrease in wraparound mortgages payable balance due to loan payoffs Decrease in wraparound mortgages payable balance due to loan payoffs Disclosure Valuation Methodologies For Investments Measured At Fair Value [Abstract] Disclosure - Valuation Methodologies for Investments Measured at Fair Value [Abstract] Disclosure - Valuation Methodologies for Investments Measured at Fair Value [Abstract] Disclosure - Valuation Methodologies for Investments Measured at Fair Value [Abstract] Fair Value Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Inputs Level 1 [Member] Fair Value, Inputs, Level 1 Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Investments By Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] U S Treasury Bond Securities [Member] US Treasury Short Term Bonds Investment Type [Axis] Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Member] Investment Type Categorization [Domain] Investment Type Categorization [Domain] Exchange Traded Funds [Member] Exchange Traded Funds Mutual Funds [Member] Mutual Funds Mutual Funds [Member] Fair Value Assets and Liabilities Measured On Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Disclosure Comprehensive Income Loss [Abstract] Disclosure - Comprehensive Income (Loss) [Abstract] Disclosure - Comprehensive Income (Loss) [Abstract] Disclosure - Comprehensive Income (Loss) [Abstract] Comprehensive Income Loss [Table] Comprehensive Income (Loss) [Table] Comprehensive Income (Loss) [Table] Comprehensive Income (Loss) [Table] Comprehensive Income Loss [Line Items] Comprehensive Income (Loss) [Line Items] Comprehensive Income (Loss) [Line Items] Comprehensive Income (Loss) [Line Items] Other Comprehensive Income Unrealized Gains Losses On Securities Net Of Tax Unrealized gain (loss) on investment securities Unrealized gain (loss) on investment securities Other Comprehensive Income, Unrealized Gains Losses On Securities, Net of Tax Other Comprehensive Income Reclassification Adjustments Net Of Tax Less: reclassification for realized (loss) gain included in net loss Other Comprehensive Income, Reclassification Adjustments Net of Tax Less: reclassification for realized (loss) gain included in net loss Other Comprehensive Income Loss Net Of Tax Other comprehensive income (loss) Other comprehensive income (loss) Disclosure Litigation Settlement Additional Information [Abstract] Disclosure - Litigation Settlement - Additional Information [Abstract] Disclosure - Litigation Settlement - Additional Information [Abstract] Disclosure - Litigation Settlement - Additional Information [Abstract] Commitments Contingencies and Litigation [Table] Commitments Contingencies And Litigation [Table] Commitments Contingencies And Litigation [Table] Commitments Contingencies And Litigation [Table] Agreement With Parties [Axis] Agreement With Parties [Axis] Agreement With Parties [Axis] Agreement With Parties [Axis] Agreement With Parties [Domain] Agreement With Parties [Domain] Agreement With Parties [Domain] Agreement With Parties [Domain] Affiliate Agreements [Member] Buyer of Ardmore, Oklahoma Affiliate Agreements [Member] Accounts Notes Loans and Financing Receivable By Receivable Type [Axis] Receivable Type [Axis] Receivable Type [Axis] Receivable Type [Domain] Receivable Type [Domain] Receivable Type [Domain] Additional [Member] Additional allowance for doubtful accounts Additional [Member] Commitments Contingencies and Litigation [Line Items] Commitments Contingencies And Litigation [Line Items] Commitments Contingencies And Litigation [Line Items] Commitments Contingencies And Litigation [Line Items] Litigation Settlement Gross Aggregate principal notes receivable Aggregate principal notes receivable Bearing Interest Rate For Promissory Notes Interest on receivable Interest on receivable Bearing Interest Rate For Promissory Notes Trade Receivable Payments Period Monthly installments date Monthly installments date Trade Receivable Payments Period Promissory Notes Receivable Promissory note Promissory note Promissory Notes Receivable Allowance For Doubtful Accounts Receivable Allowance for doubtful accounts Allowance for doubtful accounts Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Business Acquisition Percentage Of Voting Interests Acquired Acquisition of undivided interest by NPAEP Acquisition of undivided interest by NPAEP Outstanding Amounts Of Accounts Receivable Sold Outstanding balance due Outstanding balance due Outstanding Amounts Of Accounts Receivable Sold Litigation Settlement Net After Settlement This element represents the net amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period. Litigation Settlement Net This element represents the net amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period. Proceeds from Lines of Credit Increase (Decrease) in Other Operating Assets (Increase) decrease in other assets (1) (Increase) decrease in other assets (1) Allowance for Loan and Lease Losses, Recoveries of Bad Debts