13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consolidating Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	$ 75,956		$ 73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400	[1]	218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	198,196		23,578	14,716	14,402
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Prepaid expenses and other assets	42,137		30,797
Total assets	2,751,550		2,530,859
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Commitments and contingencies	0		0
Total liabilities and stockholders’ equity	2,751,550		2,530,859
DuPont Fabros Technology, L.P. [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	75,956		73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Less: accumulated depreciation	(391,404)		(325,740)
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400		218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	193,900		19,282	14,420	10,097
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Investment in affiliates	0		0
Prepaid expenses and other assets	42,137		30,797
Total assets	2,747,254		2,526,563
Line of credit	0		18,000
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Redeemable partnership units	409,280		453,889
Commitments and contingencies	0		0
General Partners' Capital	8,985		9,525
Total partners’ capital	1,229,149		1,262,136
Total liabilities and stockholders’ equity	2,747,254		2,526,563
DuPont Fabros Technology, L.P. [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	0		0
Buildings and improvements	0		0
Income producing property	0		0
Less: accumulated depreciation	0		0
Net income producing property	0		0
Construction in progress and land held for development	0		0
Net real estate	0		0
Cash and cash equivalents	192,976		18,240	12,763	9,174
Rents and other receivables	4,059		15
Deferred rent	0		0
Lease contracts above market value, net	0		0
Deferred costs, net	19,624		10,711
Investment in affiliates	2,306,880		2,280,723
Prepaid expenses and other assets	2,073		2,101
Total assets	2,525,612		2,311,790
Line of credit	0		18,000
Mortgage notes payable	0		0
Unsecured Term Loan	120,000
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	4,698		3,240
Construction costs payable	0		5
Accrued interest payable	4,645		2,290
Distribution payable	25,902		22,177
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	49		53
Total liabilities	887,183		595,765
Redeemable partnership units	409,280		453,889
Commitments and contingencies	0		0
General Partners' Capital	8,985		9,525
Total partners’ capital	1,229,149		1,262,136
Total liabilities and stockholders’ equity	2,525,612		2,311,790
DuPont Fabros Technology, L.P. [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	74,885		72,126
Buildings and improvements	2,317,597		2,210,314
Income producing property	2,392,482		2,282,440
Less: accumulated depreciation	(365,742)		(302,745)
Net income producing property	2,026,740		1,979,695
Construction in progress and land held for development	111,417		204,533
Net real estate	2,138,157		2,184,228
Cash and cash equivalents	0		361	1,259	196
Rents and other receivables	2,266		2,729
Deferred rent	141,901		135,937
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	17,822		20,442
Investment in affiliates	0		0
Prepaid expenses and other assets	38,188		26,877
Total assets	2,347,763		2,380,829
Line of credit	0		0
Mortgage notes payable	0		139,600
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	18,760		16,312
Construction costs payable	3,991		6,100
Accrued interest payable	0		311
Distribution payable	0		0
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	47,865		32,478
Total liabilities	82,019		208,823
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	2,265,744		2,172,006
Total liabilities and stockholders’ equity	2,347,763		2,380,829
DuPont Fabros Technology, L.P. [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	1,071		1,071
Buildings and improvements	102,526		105,185
Income producing property	103,597		106,256
Less: accumulated depreciation	(25,662)		(22,995)
Net income producing property	77,935		83,261
Construction in progress and land held for development	85,983		14,401
Net real estate	163,918		97,662
Cash and cash equivalents	924		681	398	727
Rents and other receivables	1,640		1,096
Deferred rent	6,539		8,892
Lease contracts above market value, net	0		0
Deferred costs, net	5,862		4,517
Investment in affiliates	0		0
Prepaid expenses and other assets	1,876		1,819
Total assets	180,759		114,667
Line of credit	0		0
Mortgage notes payable	115,000		0
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	3,219		2,728
Construction costs payable	18,252		229
Accrued interest payable	6		0
Distribution payable	0		0
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	3,146		2,993
Total liabilities	139,623		5,950
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	41,136		108,717
Total liabilities and stockholders’ equity	180,759		114,667
DuPont Fabros Technology, L.P. [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	0		0
Buildings and improvements	0		0
Income producing property	0		0
Less: accumulated depreciation	0		0
Net income producing property	0		0
Construction in progress and land held for development	0		0
Net real estate	0		0
Cash and cash equivalents	0		0	0	0
Rents and other receivables	0		0
Deferred rent	0		0
Lease contracts above market value, net	0		0
Deferred costs, net	0		0
Investment in affiliates	(2,306,880)		(2,280,723)
Prepaid expenses and other assets	0		0
Total assets	(2,306,880)		(2,280,723)
Line of credit	0		0
Mortgage notes payable	0		0
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	0		0
Construction costs payable	0		0
Accrued interest payable	0		0
Distribution payable	0		0
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	0		0
Total liabilities	0		0
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	(2,306,880)		(2,280,723)
Total liabilities and stockholders’ equity	(2,306,880)		(2,280,723)
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	166,250		166,250
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	166,250		166,250
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	868,914		901,361
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	868,914		901,361
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	2,265,744		2,172,006
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	41,136		108,717
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	$ (2,306,880)		$ (2,280,723)

[1] (1)Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase II and SC2).