2.2.0.25falsefalse00400 - Statement - Consolidated Statements of Cash FlowstruefalseIn Thousandsfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) / shares USD ($) $Duration_1_1_2011_To_3_31_2011http://www.sec.gov/CIK0000866368duration2011-01-01T00:00:002011-03-31T00:00:00Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) / shares USD ($) $Duration_1_1_2010_To_3_31_2010http://www.sec.gov/CIK0000866368duration2010-01-01T00:00:002010-03-31T00:00:00Unit13Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.falsefalseCash flows from operating activities:4false0us-gaap_ProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse2467300024673falsetruefalsefalsefalse2truefalsefalse2784100027841falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) falsefalseNet income5true0us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseAdjustments to reconcile net income to net cash provided by operating activities:6false0psb_DepreciationAndAmortizationIncludingAmountsInDiscontinuedOperationspsbfalsedebitdurationThe current period expense charged against earnings on long-lived, physical assets not used in production, and which are not...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2085900020859falsefalsefalsefalsefalse2truefalsefalse1819000018190falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Includes amounts in discontinued operations.No authoritative reference available.falsefalseDepreciation and amortization expense7false0psb_InPlaceLeaseAdjustmentpsbfalsedebitdurationThe net amortization of above-market and below-market in-place lease valuefalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse209000209falsefalsefalsefalsefalse2truefalsefalse-37000-37falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net amortization of above-market and below-market in-place lease valueNo authoritative reference available.falsefalseIn-place lease adjustment8false0psb_LeaseIncentivesNetOfTenantImprovementReimbursementspsbfalsedebitdurationThe net amortization of lease incentives and tenant improvement reimbursementsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-194000-194falsefalsefalsefalsefalse2truefalsefalse-163000-163falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net amortization of lease incentives and tenant improvement reimbursementsNo authoritative reference available.falsefalseTenant improvement reimbursements net of lease incentives9false0us-gaap_AmortizationOfDebtDiscountPremiumus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-61000-61falsefalsefalsefalsefalse2truefalsefalse-69000-69falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe component of interest income or expense representing the periodic increase in or charge against earnings to reflect amortization of debt discounts and premiums over the life of the related debt instruments, which are liabilities of the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 falsefalseAmortization of mortgage premium10false0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-5153000-5153falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryGain (loss) after tax expense (benefit), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b falsefalseGain on sale of real estate facility11false0us-gaap_ShareBasedCompensationus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse458000458falsefalsefalsefalsefalse2truefalsefalse615000615falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseStock compensation12false0us-gaap_IncreaseDecreaseInOperatingAssetsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse10990001099falsefalsefalsefalsefalse2truefalsefalse942000942falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate amount of assets used to generate operating income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseDecrease in receivables and other assets13false0us-gaap_IncreaseDecreaseInOperatingLiabilitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-1807000-1807falsefalsefalsefalsefalse2truefalsefalse-699000-699falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseDecrease in accrued and other liabilities14false0us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse2056300020563falsefalsefalsefalsefalse2truefalsefalse1362600013626falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 truefalseTotal adjustments15false0us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse4523600045236falsefalsefalsefalsefalse2truefalsefalse4146700041467falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash provided by operating activities16true0us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCash flows from investing activities:17false0us-gaap_PaymentsForCapitalImprovementsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-8043000-8043falsefalsefalsefalsefalse2truefalsefalse-7055000-7055falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c falsefalseCapital improvements to real estate facilities18false0us-gaap_PaymentsToAcquireRealEstateus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-58417000-58417falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 falsefalseAcquisition of real estate facilities19false0us-gaap_ProceedsFromSaleOfRealEstateus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse91810009181falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCash received for the sale of real estate that is not part of an investing activity during the current period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 24 falsefalseProceeds from sale of real estate facility20false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-8043000-8043falsefalsefalsefalsefalse2truefalsefalse-56291000-56291falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash used in investing activities21true0us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCash flows from financing activities:22false0us-gaap_ProceedsFromNotesPayableus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse121000000121000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a borrowing supported by a written promise to pay an obligation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b falsefalseBorrowings on note payable to affiliate23false0us-gaap_RepaymentsOfLinesOfCreditus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-93000000-93000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b falsefalseRepayment of credit facility24false0psb_PrincipalPaymentsOnMortgageNotesPayablepsbfalsecreditdurationPrincipal payments on mortgage notes payablefalsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-278000-278falsefalsefalsefalsefalse2truefalsefalse-274000-274falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPrincipal payments on mortgage notes payableNo authoritative reference available.falsefalsePrincipal payments on mortgage notes payable25false0us-gaap_RepaymentsOfSecuredDebtus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-2660000-2660falsefalsefalsefalsefalse2falsefalsefalse00  falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the payment of collateralized debt obligation (backed by pledge, mortgage or other lien in the entity's assets).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b falsefalseRepayment of mortgage note payable26false0us-gaap_ProceedsFromStockOptionsExercisedus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse944000944falsefalsefalsefalsefalse2truefalsefalse26490002649falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from holders exercising their stock options.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a falsefalseProceeds from the exercise of stock options27false0us-gaap_PaymentsToMinorityShareholdersus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-39087000-39087falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow to return capital to noncontrolled interest, which generally occurs when noncontrolling shareholders reduce their ownership stake (in a subsidiary of the entity). This element does not include dividends paid to noncontrolling shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a falsefalseRepurchase of preferred units28false0us-gaap_PaymentsOfDividendsCommonStockus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-10867000-10867falsefalsefalsefalsefalse2truefalsefalse-10747000-10747falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a falsefalseDistributions paid to common shareholders29false0psb_DistributionsPaidToPreferredShareholderspsbfalsedebitdurationDistributions paid to preferred shareholdersfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-10450000-10450falsefalsefalsefalsefalse2truefalsefalse-11155000-11155falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDistributions paid to preferred shareholdersNo authoritative reference available.falsefalseDistributions paid to preferred shareholders30false0psb_DistributionsPaidToNoncontrollingInterestsCommonUnitspsbfalsedebitdurationDistributions paid to noncontrolling interests - common unitsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-3214000-3214falsefalsefalsefalsefalse2truefalsefalse-3214000-3214falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDistributions paid to noncontrolling interests - common unitsNo authoritative reference available.falsefalseDistributions paid to noncontrolling interests - common units31false0psb_DistributionsPaidToNoncontrollingInterestsPreferredUnitspsbfalsedebitdurationDistributions paid to noncontrolling interests -- preferred unitsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-99000-99falsefalsefalsefalsefalse2truefalsefalse-1382000-1382falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDistributions paid to noncontrolling interests -- preferred unitsNo authoritative reference available.falsefalseDistributions paid to noncontrolling interests - preferred units32false0us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-37711000-37711falsefalsefalsefalsefalse2truefalsefalse-24123000-24123falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from financing activity for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet cash used in financing activities33false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-518000-518falsefalsefalsefalsefalse2truefalsefalse-38947000-38947falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 truefalseNet decrease in cash and cash equivalents34false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse50660005066falsefalsefalsefalsefalse2truefalsefalse208229000208229falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 falsefalseCash and cash equivalents at the beginning of the period35false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse45480004548falsefalsefalsefalsefalse2truefalsefalse169282000169282falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 falsefalseCash and cash equivalents at the end of the period36true0psb_AdjustmentToNoncontrollingInterestsInUnderlyingOperatingPartnershipAbstractpsbfalsenadurationAdjustment to noncontrolling interests in underlying operating partnership [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAdjustment to noncontrolling interests in underlying operating partnership [Abstract]falsefalseAdjustment to noncontrolling interests in underlying operating partnership:37false0psb_AdjustmentToNoncontrollingInterestsCommonUnitspsbfalsecreditdurationThe effect of the adjustment on noncontrolling interests-common units to reflect the noncontrolling interests' equity...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse90280009028falsefalsefalsefalsefalse2truefalsefalse8900089falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect of the adjustment on noncontrolling interests-common units to reflect the noncontrolling interests' equity interest in the CompanyNo authoritative reference available.falsefalseNoncontrolling interests - common units38false0psb_AdjustmentToNoncontrollingInterestsPaidInCapitalpsbfalsedebitdurationThe effect of the adjustment on paid-in capital to reflect the noncontrolling interests' equity interest in the Companyfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-9028000-9028falsefalsefalsefalsefalse2truefalsefalse-89000-89falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect of the adjustment on paid-in capital to reflect the noncontrolling interests' equity interest in the CompanyNo authoritative reference available.falsefalsePaid-in capital39true0psb_GainOnRepurchaseOfPreferredEquityAbstractpsbfalsenadurationGain on repurchase of preferred equity [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringGain on repurchase of preferred equity [Abstract]falsefalseGain on repurchase of preferred equity:40false0psb_GainOnRepurchasePreferredUnitspsbfalsedebitdurationThe effect of the gain on repurchase of preferred unitsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-8748000-8748falsefalsefalsefalsefalse2falsefalsefalse00  falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect of the gain on repurchase of preferred unitsNo authoritative reference available.falsefalsePreferred units41false0psb_GainOnRepurchaseOfPreferredEquityPaidInCapitalpsbfalsedebitdurationThe effect of the gain on repurchase of preferred equity on paid-in capitalfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse87480008748falsefalsefalsefalsefalse2falsefalsefalse00  falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect of the gain on repurchase of preferred equity on paid-in capitalNo authoritative reference available.falsefalsePaid-in capital42true0psb_EffectOfRedemptionRepurchaseOfPreferredEquityAbstractpsbfalsenadurationEffect of redemption/repurchase of preferred equity:falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringEffect of redemption/repurchase of preferred equity:falsefalseIssuance costs related to the repurchase of preferred equity:43false0psb_EffectOfRedemptionRepurchaseOfPreferredEquityOnNoncontrollingInterestCommonUnitspsbfalsedebitdurationThe effect on noncontrolling interests-common units from the recognition of issuance costs related to the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-1359000-1359falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect on noncontrolling interests-common units from the recognition of issuance costs related to the redemption/repurchase of preferred unitsNo authoritative reference available.falsefalseNoncontrolling interest - common units44false0psb_EffectOfRedemptionRepurchaseOfPreferredEquityOnPaidInCapitalpsbfalsedebitdurationThe effect on paid-in capital from the recognition of issuance costs related to the redemption/repurchase of preferred equityfalsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse13590001359falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect on paid-in capital from the recognition of issuance costs related to the redemption/repurchase of preferred equityNo authoritative reference available.falsefalsePaid-in capital242Consolidated Statements of Cash Flows (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue