Commitments And Contingencies (Details)	3 Months Ended				3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 GBP (£)	Jul. 11, 2012 USD ($)	Jul. 11, 2012 GBP (£)	Mar. 31, 2013 29 A International Business Park [Member] USD ($)	Mar. 31, 2013 29 A International Business Park [Member] SGD	Mar. 31, 2013 Convergence Business Park [Member] USD ($)
Commitments and Contingencies [Line Items]
Contingent liability	$ 91,900,000	£ 60,500,000	$ 87,600,000	£ 56,500,000
Change in fair value of accrued contingent consideration	1,300,000
Additional performance based consideration earned (maximum)						50,000,000
Additional performance based consideration earned (maximum), adjusted for exchange rate					40,300,000
Expiration of earnout contingency					November 2020	November 2020
Lease expiration period							April 2017
Sale price of building							24,000,000
Real estate price, per square acre							225,000
Commitments related to construction contracts	$ 261,400,000