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Subsequent Events (Details) (USD $) In Millions | 1 Months Ended
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Sep. 30, 2011
Northern Virginia Industrial Park II [Member] |
Proceeds from sales of business | $ 44.5
Columbia Park Road And Dulles Business Park [Member] |
Proceeds from sales of business | $ 70.6

X
- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + Details
Name: | us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration