2.4.0.8126 - Disclosure - Future Interest Agreement - Additional Information (Detail)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$P12_01_2012To12_31_2012http://www.sec.gov/CIK0000926843duration2012-12-01T00:00:002012-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$PAsOn06_30_2013http://www.sec.gov/CIK0000926843instant2013-06-30T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false truefalseP01_01_2013To06_30_2013_TwoThousandThreeAgreementMemberusgaapDebtInstrumentAxishttp://www.sec.gov/CIK0000926843duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseThe 2003 Agreementus-gaap_DebtInstrumentAxisxbrldihttp://xbrl.org/2006/xbrldick0000926843_TwoThousandThreeAgreementMemberus-gaap_DebtInstrumentAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli01true 3us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Instruments Owned and Pledged as Collateral [Line Items]2false 4us-gaap_DebtInstrumentDescriptionus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00The terms of the 2003 Agreement provided that NPAEP and PVPG: (a) reduce to 4.1% per year the annual interest rate payable on any NPAEP Wrap Note or PVPG Wrap Note that bears a stated annual interest rate in excess of that amount (the reduction in the interest rate was evaluated by NPAMLP in accordance with FASB authoritative guidance, and was determined not to be a substantial modification of terms as defined therein); (b) remove certain of the properties secured by the NPAEP and PVPG Wrap Mortgages from the burden of the cross-default and cross-collateralization provisions currently contemplated by the Restructuring Agreement effective as of January 1, 1990 by and among MLPG, NPAMLP, National Property Analysts, Inc. and others; and (c) agree to release the lien of the Wrap Mortgages from the Properties upon a sale of or the agreement of a leasehold estate in any Property prior to the maturity of the applicable Wrap Note. In consideration for the above, NPAMLP modified the NPAEP Wrap Mortgages and the PVPG Wrap Mortgages to provide that (i) there is an event of default under the applicable NPAEP Wrap Mortgages or PVPG Wrap Mortgages, as the case may be, if a judgment or other lien is entered against the title or lease-holding entity thereby entitling NPAEP or PVPG, as the case may be, to avail itself of the post-default rights or remedies under the relevant security document; and (ii) for cross-default and cross-collateralization among certain partnerships comprising NPAMLP. In addition NPAMLP shall execute and deliver to NPAEP or PVPG, as the case may be, a currently recordable deed of future interest (or assignment of future leasehold interest) sufficient to convey to NPAEP or PVPG, as the case may be, all of NPAMLPs right, title, interest and estate in and to its fee or leasehold interest in the encumbered properties effective upon the maturity on December 31, 2013 of the NPAEP Wrap Mortgages and the PVPG Wrap Mortgages unless the Wrap Mortgages have previously been paid in full.falsefalsefalsexbrli:stringItemTypestringIdentification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 false0Debt agreement3false 4us-gaap_DebtInstrumentInterestRateEffectivePercentageus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.0410.041falsefalsefalsenum:percentItemTypepureEffective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false0Annual interest rate payable on any NPAEP Wrap Note or PVPG Wrap Note4false 4ck0000926843_EffectiveDateck0000926843_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse002003-01-01falsefalsefalseus-types:dateStringItemTypenormalizedstringEffective DateNo definition available.false0Effective date of agreement between NPAMLP, NPAEP and Penn Valley Pension Group ("PVPG")5false 4ck0000926843_WraparoundMortgageEstimatedPayableck0000926843_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse110000000110000USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryWraparound mortgage estimated payableNo definition available.false2Wraparound mortgage estimated payable6false 4ck0000926843_ProceedsFromSaleOfPurchaseRightsck0000926843_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse100000100USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryProceeds from sale of purchase rightsNo definition available.false2Proceeds from sale of purchase rightsfalseFuture Interest Agreement - Additional Information (Detail) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.0000926843.com/role/FutureInterestAgreementAdditionalInformationDetail36