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Debt Of The Operating Partnership (Summary Of Outstanding Indebtedness Of The Operating Partnership - Mortgage Loans) (Details)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Secured Term Debt [Member]
USD ($)
item
property
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Secured Term Debt [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
200 Paul Avenue 1-4 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
200 Paul Avenue 1-4 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Mundells Roundabout [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Mundells Roundabout [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
2045 & 2055 LaFayette Street [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
2045 & 2055 LaFayette Street [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
34551 Ardenwood Boulevard 1-4 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
34551 Ardenwood Boulevard 1-4 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
1100 Space Park Drive [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
1100 Space Park Drive [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
600 West Seventh Street [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
600 West Seventh Street [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
150 South First Street [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
150 South First Street [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
360 Spear Street [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
360 Spear Street [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
2334 Lundy Place [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
2334 Lundy Place [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Clonshaugh Industrial Estate II [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Clonshaugh Industrial Estate II [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
1500 Space Park Drive [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
1500 Space Park Drive [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Cressex 1 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Cressex 1 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Paul van Vlissingenstraat 16 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Paul van Vlissingenstraat 16 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Chemin de l'Epinglier 2 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Chemin de l'Epinglier 2 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Gyroscoopweg 2E-2F [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Gyroscoopweg 2E-2F [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Manchester Technopark [Member]
USD ($)
property
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Manchester Technopark [Member]
GBP (£)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
Manchester Technopark [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
8025 North Interstate 35 [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
8025 North Interstate 35 [Member]
USD ($)
Mar. 31, 2013
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
731 East Trade Street [Member]
USD ($)
Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
731 East Trade Street [Member]
USD ($)
Mar. 31, 2013
GBP [Member]
USD ($)
Dec. 31, 2012
GBP [Member]
USD ($)
Mar. 31, 2013
EUR [Member]
USD ($)
Dec. 31, 2012
EUR [Member]
USD ($)
Dec. 31, 2012
EUR [Member]
Digital Realty Trust, L.P. [Member]
Mortgage Loans [Member]
USD ($)
Debt of the Operating Partnership [Line Items]                                                                                                      
Interest rate               5.65% [1],[2]   5.74% [1]       5.93% [1]   5.95% [1]   5.89% [1]   5.80%   6.30% [1]   6.32% [1]   5.96% [1]       6.15% [1]   5.68%               5.68% [3] 5.68% [3]   4.09%   8.22%            
Variable Rate Basis                       3-month GBP LIBOR + 1.20% [4]                               3-month EURIBOR + 4.50% [4],[5]           3-month EURIBOR + 1.60% [4]   3-month EURIBOR + 1.50% [4]   3-month EURIBOR + 1.50% [4]                          
Basis spread on variable rate                       1.20% [4]                               4.50% [4]           1.60% [4]   1.50% [4]   1.50% [4]                          
Maturity Date               Nov. 11, 2014 [1],[2]   Oct. 08, 2015 [1]   Nov. 30, 2013   Feb. 06, 2017 [1]   Nov. 11, 2016 [1]   Dec. 11, 2016 [1]   Mar. 15, 2016   Feb. 06, 2017 [1]   Nov. 08, 2013 [1]   Nov. 11, 2016 [1]   Sep. 04, 2014 [5]   Oct. 05, 2013 [1]   Oct. 16, 2014   Jul. 18, 2013   Jul. 18, 2013   Oct. 18, 2013   Oct. 16, 2014 [3] Oct. 16, 2014 [3]   Mar. 06, 2016   Jul. 01, 2020            
Unamortized net premium     $ 1,298,000     $ 1,298,000 [6] $ 1,542,000                                                                                        
Mortgage loans, net of premiums 779,273,000 792,376,000 779,273,000 792,376,000   779,273,000 [6] 792,376,000 135,225,000 [1],[2] 135,991,000 [1],[2] 72,159,000 [1] 72,646,000 [1] 65,085,000 [7] 69,612,000 [7] 64,364,000 [1] 64,621,000 [1] 52,718,000 [1] 52,916,000 [1] 52,689,000 [1] 52,889,000 [1] 50,777,000 51,174,000 50,640,000 [1] 50,830,000 [1] 46,352,000 [1] 46,613,000 [1] 38,342,000 [1] 38,486,000 [1] 38,457,000 [5],[8] 39,579,000 [5],[8] 35,104,000 [1] 35,682,000 [1] 26,586,000 [7] 28,560,000 [7] 12,904,000 [8] 13,336,000 [8] 9,337,000 [8] 9,649,000 [8] 8,217,000 [8] 8,492,000 [8] 8,088,000 [3],[7]   8,688,000 [3],[7] 6,500,000 6,561,000 4,431,000 4,509,000          
Mortgage loans on real estate, number               6                                                                                      
Number of properties               6                                                               2 2                    
Exchange rate         1.28 1.52 1.63                                                                               1.52 1.63 1.28 1.32 1.32
Letter of credit security amount                                                                                 7,800,000                    
Total indebtedness     $ 4,682,124,000 $ 4,278,565,000                                                                                              
[1] The respective borrower’s assets and credit are not available to satisfy the debts and other obligations of affiliates or any other person.
[2] This amount represents six mortgage loans secured by our interests in 36 NE 2nd Street, 3300 East Birch Street, 100 & 200 Quannapowitt Parkway, 300 Boulevard East, 4849 Alpha Road, and 11830 Webb Chapel Road. Each of these loans is cross-collateralized by the six properties.
[3] These loans are also secured by a £7.8 million letter of credit. These loans are cross-collateralized by the two properties.
[4] We have entered into interest rate swap agreements as a cash flow hedge for interest generated by these US LIBOR, EURIBOR and GBP LIBOR based loans as well as the U.S. dollar and Singapore dollar tranches of the unsecured term loan. See note 13, “Derivative Instruments” for further information.
[5] The Operating Partnership or its subsidiary provides a limited recourse guarantee with respect to this loan.
[6] Our mortgage loans are generally non-recourse to us, subject to carve-outs for specified actions by us or specified undisclosed environmental liabilities. As of March 31, 2013, we provided limited recourse guarantees with respect to approximately $38.5 million of the outstanding mortgage indebtedness, and partial letter of credit support with respect to approximately an additional $34.7 million of the outstanding mortgage indebtedness (based on exchange rates as of March 31, 2013).
[7] Based on exchange rate of $1.52 to £1.00 as of March 31, 2013 and $1.63 to £1.00 as of December 31, 2012.
[8] Based on exchange rate of $1.28 to €1.00 as of March 31, 2013 and $1.32 to €1.00 as of December 31, 2012.