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Tax Credit Transactions (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 3 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  |
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Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Historic Tax Credit Transaction [Member] | Mar. 31, 2011 Historic Tax Credit Transaction [Member] | Dec. 31, 2011 Historic Tax Credit Transaction [Member] | Nov. 17, 2008 Historic Tax Credit Transaction [Member] sqft | Mar. 31, 2012 New Markets Tax Credit Transaction [Member] | Oct. 19, 2011 USB [Member] Historic Tax Credit Transaction [Member] | Jun. 30, 2010 USB [Member] Historic Tax Credit Transaction [Member] | Dec. 31, 2009 USB [Member] Historic Tax Credit Transaction [Member] | Nov. 30, 2008 USB [Member] Historic Tax Credit Transaction [Member] | Mar. 31, 2012 USB [Member] Historic Tax Credit Transaction [Member] | Dec. 31, 2011 USB [Member] Historic Tax Credit Transaction [Member] | Aug. 27, 2010 USB [Member] Historic Tax Credit Transaction [Member] | Mar. 31, 2012 USB [Member] New Markets Tax Credit Transaction [Member]
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of IRS Philadelphia Campus building (in square foot) |  |  |  |  |  | 862,692 |  |  |  |  |  |  |  |  |
Percentage of building leased to IRS |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Agreed contribution in project cost by USB |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,100,000 |
Amount received in advance for project cost |  |  |  |  |  |  |  |  | 27,400,000 | 23,800,000 | 10,200,000 |  |  |  |
Amount received from contribution |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |
Tax credit conditions |  |  | 20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus |  |  |  | 100% recapture for a period of seven years as provided in the Internal Revenue Code |  |  |  |  |  |  |  |
Percentage of tax credit recapture | 100.00% |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
USB contributions presented within deferred income |  |  |  |  |  |  | 13,300,000 |  |  |  |  | 51,600,000 | 51,600,000 |  | 13,300,000
Contribution allocated in non controlling interest |  |  | 2,400,000 |  | 2,400,000 |  |  |  |  |  |  |  |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period |  |  | over the five year credit recapture period as defined in the Internal Revenue Code |  |  |  |  |  |  |  |  |  |  |  |
Cash received as revenue |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |
Allocated expenses within other income (expense) |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Deferred transaction costs | 118,685,000 | 115,362,000 | 2,100,000 |  | 2,100,000 |  | 5,300,000 |  |  |  |  |  |  |  |
Rate of return on noncontrolling interest expected |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Accretion of non-controlling interest liability |  |  | 400,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |
Expected Benefit From a Qualified NMTC Program |  |  |  |  |  |  | $ 7,800,000 |  |  |  |  |  |  |  |
Limit on tax credit claims under the Community Renewal Tax Relief | up to 39% of qualified investments in qualified, active low-income businesses or ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of qualified investments | 39.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years |  |  | 5 years |  |  |  | 7 years |  |  |  |  |  |  |  |

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