Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Consolidation	Basis of Consolidation Our consolidated financial statements reflect all of our accounts, including those of our controlled subsidiaries and our tenancy-in-common interests as described below. The portion of equity in a consolidated subsidiary that is not attributable, directly or indirectly, to us is presented as noncontrolling interests. All significant intercompany accounts and transactions have been eliminated. At June 30, 2014, we had six investments in tenancy-in-common interests in various domestic and international properties, five of which we consolidate because we own 100% of these investments and account for the remaining jointly-owned investment using the equity method of accounting. Consolidation of the remaining investment is not required as such interest does not qualify as a VIE and do not meet the control requirement required for consolidation. Accordingly, we account for this investment using the equity method of accounting. We use the equity method of accounting because the shared decision-making involved in a tenancy-in-common interest investment provides us with significant influence on the operating and financial decisions of these investments. We apply accounting guidance for consolidation of VIEs to certain entities in which the equity investors do not have the characteristics of a controlling financial interest or do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. Fixed price purchase and renewal options within a lease as well as certain decision-making rights within a loan can cause us to consider an entity a VIE. In connection with the CPA^®:16 Merger, we acquired 12 VIEs. We consider these entities VIEs because the leases have either fixed price purchase or renewal options. In connection with our acquisition of a property during the six months ended June 30, 2014 (Note 5), we assigned the property to a third-party special purpose entity, or SPE, and provided a loan to the SPE to purchase the property. The SPE is funded solely from that loan and does not have any equity investment at risk. As such, the SPE is deemed to be a VIE in which we are the primary beneficiary and which we consolidate. Additionally, we own interests in single-tenant net-leased properties leased to companies through noncontrolling interests in partnerships and limited liability companies that we do not control but over which we exercise significant influence. We account for these investments under the equity method of accounting. At times, the carrying value of our equity investments may fall below zero for certain investments. We intend to fund our share of the investments’ future operating deficits should the need arise. However, we have no legal obligation to pay for any of the liabilities of such investments nor do we have any legal obligation to fund operating deficits.
Recent Accounting Requirements	Recent Accounting Requirements The following Accounting Standards Updates, or ASUs, promulgated by the Financial Accounting Standards Board are applicable to us: ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. ASU 2014-09 does not apply to our rental revenues, but will apply to reimbursed tenant costs and revenues generated from our operating properties and our Investment Management business. Additionally, this guidance modifies disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU 2014-09 is effective for us in 2017, and early adoption is not permitted. In adopting ASU 2014-09, companies may use either a full retrospective or a modified retrospective approach. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2017. ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). ASU 2014-08 changes the requirements for reporting discontinued operations. A discontinued operation may include a component of an entity or a group of components of an entity, or a business. Under this new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a “strategic shift that has or will have a major effect on an entity’s operations and financial results.” The new guidance also requires disclosures including pretax profit or loss and significant gains or losses arising from dispositions that represent an “individually significant component of an entity,” but do not meet the criteria to be reported as discontinued operations under ASU 2014-08. In the ordinary course of business we sell properties, which, under prior accounting guidance, we generally reported as discontinued operations; however, under ASU 2014-08 such property dispositions typically would not meet the criteria to be reported as discontinued operations. We elected to early adopt ASU 2014-08 prospectively for all dispositions after December 31, 2013. Consequently, individually significant properties that were sold or classified as held-for-sale during 2014 were not reclassified to discontinued operations in the consolidated financial statements, but have been disclosed in Note 15 to the consolidated financial statements. By contrast, and as required by the new guidance, the results for the current and prior year period reflect as discontinued operations in the consolidated financial statements all dispositions and assets classified as held-for-sale through December 31, 2013 that were deemed under the prior accounting guidance to be discontinued operations, as well as those assets classified as held-for-sale as part of the CPA^®:16 Merger. This ASU did not have a significant impact on our financial position or results of operations for any of the periods presented. ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. ASU 2013-11 requires an entity to present an unrecognized tax benefit relating to a net operating loss carryforward, a similar tax loss or a tax credit carryforward as a reduction to a deferred tax asset except in certain situations. To the extent the net operating loss carryforward, similar tax loss or tax credit carryforward is not available as of the reporting date under the governing tax law to settle any additional income taxes that would result from the disallowance of the tax position, or the governing tax law does not require the entity to use and the entity does not intend to use the deferred tax asset for such purpose, the unrecognized tax benefit should be presented as a liability and should not be netted against a deferred tax asset. ASU 2013-11 became effective for us at the beginning of 2014. The adoption of ASU 2013-11 did not have a material impact on our financial condition or results of operations.
Intangible Assets and Liabilities and Goodwill	Amortization of below-market rent and above-market rent is recorded as an adjustment to Lease revenues; amortization of management contracts, in-place lease and tenant relationship intangibles is included in Depreciation and amortization; and amortization of above-market ground lease and below-market ground lease is included in Property expenses. In connection with our acquisitions of properties, we have recorded net lease intangibles that are being amortized over periods ranging from one year to 40 years. In addition, we have several ground lease intangibles that are being amortized over periods up to 134 years. In-place lease and above-market rent are included in In-place lease intangible assets, net and Above-market rent intangible assets, net, respectively, in the consolidated financial statements. Tenant relationship, below-market ground lease (as lessee), trade name, management contracts and software license intangibles are included in Other assets, net in the consolidated financial statements. Below-market rent, above-market ground lease (as lessee), and below-market purchase option intangibles are included in Below-market rent and other intangible liabilities, net in the consolidated financial statements.
Fair Value Measurement	The fair value of an asset is defined as the exit price, which is the amount that would either be received when an asset is sold or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The guidance establishes a three-tier fair value hierarchy based on the inputs used in measuring fair value. These tiers are: Level 1, for which quoted market prices for identical instruments are available in active markets, such as money market funds, equity securities and U.S. Treasury securities; Level 2, for which there are inputs other than quoted prices included within Level 1 that are observable for the instrument, such as certain derivative instruments including interest rate caps and swaps; and Level 3, for securities that do not fall into Level 1 or Level 2 and for which little or no market data exists, therefore requiring us to develop our own assumptions.
Earnings Per Share	Under current authoritative guidance for determining earnings per share, all unvested share-based payment awards that contain non-forfeitable rights to distributions are considered to be participating securities and therefore are included in the computation of earnings per share under the two-class method. The two-class method is an earnings allocation formula that determines earnings per share for each class of common shares and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Our unvested RSUs and RSAs contain rights to receive non-forfeitable distribution equivalents, and therefore we apply the two-class method of computing earnings per share. The calculation of earnings per share below excludes the income attributable to the unvested RSUs and RSAs from the numerator and such unvested shares in the denominator.
Redeemable Noncontrolling Interest	We account for the noncontrolling interest in WPCI held by a third party as a redeemable noncontrolling interest, as we have an obligation to repurchase the interest at fair value, subject to certain conditions. This obligation is required to be settled in shares of our common stock. The third-party interest is reflected at estimated redemption value for all periods presented. On October 1, 2013, we received a notice from the holder of the noncontrolling interest in WPCI regarding the exercise of the put option, pursuant to which we are required to purchase the third party’s
Discontinued Operations	From time to time, we may decide to sell a property. We have an active capital recycling program, with a goal of extending the average lease term through reinvestment, improving portfolio credit quality through dispositions and acquisitions of assets, increasing the asset criticality factor in our portfolio and/or executing strategic dispositions of assets. We may make a decision to dispose of a property when it is vacant as a result of tenants vacating space, tenants electing not to renew their leases, tenant insolvency, or lease rejection in the bankruptcy process. In such cases, we assess whether we can obtain the highest value from the property by selling it, as opposed to re-leasing it. We may also sell a property when we receive an unsolicited offer or negotiate a price for an investment that is consistent with our strategy for that investment. When it is appropriate to do so, we classify the property as an asset held for sale on our consolidated balance sheet and, for those properties sold or classified as held-for-sale prior to January 1, 2014, the current and prior period results of operations of the property have been reclassified as discontinued operations under current accounting guidance (Note 2).

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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+ Details

- Definition

Disclosure of accounting policy for any discontinued operations. The results of operations of a component of an entity that either has been disposed of or is classified as held for sale is reported in discontinued operations if both: (a) the operations and cash flows of the component have been (or will be) eliminated from the ongoing operations of the entity as a result of the disposal transaction and (b) the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction. If the entity elects to allocate interest expense to a discontinued operation, it may disclose its accounting policy for this election and describe its method of allocation.

+ References+ Details

- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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