1.0.0.3 false Consolidated Balance Sheets [Parentheticals] (USD $) In Hundreds, except Share data, unless otherwise specified false 1 $ false false Unit_1 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit_2 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit_3 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit_4 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Unit_1 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit_2 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit_3 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit_4 Standard http://www.xbrl.org/2003/instance shares xbrli 0 3 Cumulative Preferred Shares of beneficial interest 1 psa_CumulativePreferredSharesOfBeneficialInterest psa false na duration string Cumulative Preferred Shares of beneficial interest false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false Cumulative Preferred Shares of beneficial interest false 4 Preferred Shares of beneficial interest 2 us-gaap_PreferredStockParOrStatedValuePerShare us-gaap true na instant decimal No definition available. false false false false false false false false false 1 false true 0.01 0.01 false false 2 false true 0.01 0.01 false false No definition available. No authoritative reference available. false 5 Shares authorized 2 us-gaap_PreferredStockSharesAuthorized us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 100000000 100000000.00 false false 2 false true 100000000 100000000.00 false false No definition available. No authoritative reference available. false 6 Shares issued 2 us-gaap_PreferredStockSharesIssued us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 886140 886140.00 false false 2 false true 887122 887122.00 false false No definition available. No authoritative reference available. false 7 Shares outstanding 2 us-gaap_PreferredStockSharesOutstanding us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 886140 886140.00 false false 2 false true 887122 887122.00 false false No definition available. No authoritative reference available. false 8 Common Shares of beneficial interest 1 us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 9 Par value 2 us-gaap_CommonStockParOrStatedValuePerShare us-gaap true na instant decimal No definition available. false false false false false false false false false 1 false true 0.10 0.10 false false 2 false true 0.10 0.10 false false No definition available. No authoritative reference available. false 10 Shares authorized 2 us-gaap_CommonStockSharesAuthorized us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 650000000 650000000.00 false false 2 false true 650000000 650000000.00 false false No definition available. No authoritative reference available. false 11 Shares issued 2 us-gaap_CommonStockSharesIssued us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 168405539 168405539.00 false false 2 false true 168279732 168279732.00 false false No definition available. No authoritative reference available. false 12 Shares outstanding 2 us-gaap_CommonStockSharesOutstanding us-gaap true na instant shares No definition available. false false false false false false false false false 1 false true 168405539 168405539.00 false false 2 false true 168279732 168279732.00 false false No definition available. No authoritative reference available. false 13 Equity Shares of beneficial interest 1 psa_EquitySharesOfBeneficialInterest psa false na duration string Equity Shares of beneficial interest false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false Equity Shares of beneficial interest false 14 Par value 2 psa_ParValue psa false debit duration monetary Face amount or stated value of equity share; generally not indicative of the fair market value per share. false false false false false false false false false 1 true true 0.01 0.01 false false 2 true true 0.01 0.01 false false Face amount or stated value of equity share; generally not indicative of the fair market value per share. No authoritative reference available. false 15 Shares authorized 2 psa_SharesAuthorized psa false na duration shares The maximum number of equity shares permitted to be issued by an entity's charter and bylaws. false false false false false false false false false 1 false true 100000000 100000000.00 false false 2 false true 100000000 100000000.00 false false The maximum number of equity shares permitted to be issued by an entity's charter and bylaws. No authoritative reference available. false 16 Shares issued 2 psa_SharesIssuedparen psa false na duration shares Total number of equity shares of an entity that have been sold or granted to shareholders (includes equityshares that were... false false false false false false false false false 1 false true 8377.193 8377.19 false false 2 false true 8377.193 8377.19 false false Total number of equity shares of an entity that have been sold or granted to shareholders (includes equityshares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. No authoritative reference available. false 17 Shares outstanding 2 psa_SharesOutstanding psa false na duration shares Total number of equity shares held by shareholders. May be all or portion of the number of equity shares authorized. These... false false false false false false false false false 1 false true 8377.193 8377.19 false false 2 false true 8377.193 8377.19 false false Total number of equity shares held by shareholders. May be all or portion of the number of equity shares authorized. These shares represent the ownership interest of the equity shares. Excludes equity shares repurchased by the entity and held as Treasury shares. Shares outstanding equals shares issued minus shares held in treasury. Does not include equity shares that have been repurchased No authoritative reference available. false false 2 15 false Hundreds NoRounding UnKnown true true