Commitments and Contingencies (Details) $ in Thousands, £ in Millions, SGD in Millions	12 Months Ended					42 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2016 SGD	Jul. 11, 2012 USD ($)	Jul. 11, 2012 GBP (£)
Commitments and Contingencies [Line Items]
Lease term	12 years
Lease term extension	5 years
Rent expense	$ 83,600	$ 24,600		$ 16,200
Increase (decrease) in fair value of contingent consideration	0	(44,276)		(8,093)
Commitments related to construction contracts	320,900
Convergence Business Park
Commitments and Contingencies [Line Items]
Sale price of building	24,000
Real estate price, per square acre	225
29A International Business Park
Commitments and Contingencies [Line Items]
Additional performance based consideration earned (maximum)	34,500							SGD 50.0
Contingent liability	23,800	23,800		12,600		$ 23,800
Sentrum Portfolio
Commitments and Contingencies [Line Items]
Contingent liability									$ 87,600	£ 56.5
Reduction in fair value		45,900	£ 30.3
Increase (decrease) in fair value of contingent consideration	$ 0	(43,000)		(8,400)
Earnout payment		$ 1,100	£ 0.7	$ 10,300	£ 6.2	$ 37,200	£ 23.8