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Leases (Narrative) (Detail) (USD $)
1 Months Ended 6 Months Ended
May 31, 2012
Jun. 30, 2012
Capital Lease Obligation [Line Items]    
Capital lease obligation liability   $ 194,798,000
Dallas IBX Leases [Member]
   
Capital Lease Obligation [Line Items]    
Expiration date of lease term December 2029  
Monthly payment interest rate 7.21%  
Total cumulative rent obligation 105,595,000  
Building asset   53,117,000
Deferred rent   4,472,000
Capital lease obligation liability   $ 57,530,000