Leases - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended	3 Months Ended
	Mar. 31, 2014 Silicon Valley 2 Capital Lease [Member]	Jun. 30, 2014 New York 1 Capital Lease [Member]	Jun. 30, 2014 New York 1 Capital Lease [Member]	Jun. 30, 2014 Dallas IBX Financing [Member]	Mar. 31, 2014 Dallas IBX Financing [Member]
Operating Leased Assets [Line Items]
Capital lease asset	$ 81,542,000	$ 28,269,000
Capital lease liability	82,000,000	28,490,000	28,490,000
Expiration date of lease	Sep. 01, 2029		Dec. 01, 2029		Dec. 01, 2029
Financing obligation liabilities				$ 28,089,000	$ 13,908,000