Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended						6 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2012 Gain (Loss) on Disposition of Assets [Member]	Dec. 31, 2012 Computer Software, Intangible Asset [Member]	Dec. 31, 2011 Letters Of Credit [Member]	Dec. 31, 2010 Letters Of Credit [Member]	Dec. 31, 2012 Letters Of Credit [Member]	Jun. 30, 2011 Letters Of Credit [Member]	Jul. 05, 2012 IPO [Member]	Jul. 05, 2012 IPO [Member]	Dec. 31, 2012 Data Centers [Member]	Dec. 31, 2012 Service Life [Member] Data Centers [Member]	Dec. 31, 2012 Facility Closing [Member]
Summary Of Significant Accounting Policies [Line Items]
Restructuring Reserve, Accelerated Depreciation															$ 1,700,000
Preferred Stock, Shares Outstanding (shares)	0		0										10,462,877	10,462,877
Deferred revenue recognized period			12 months
Original maturities of cash and cash equivalents			Three months or less
Useful life of capitalized software								5 years
Software Development Cost	0	0	4,500,000	0		0
Current portion of deferred rent recognized period			12 months
Lease Abandonment Costs	0	0	(2,467,000)	0		0	2,467,000
Facility exit obligation																	2,345,000
Facility exit obligation, current			1,300,000
Facility exit obligation, non- current			1,000,000
Risk-free discount rate			5.08%
Period of amortization of debt discount			12 months
Stock options vesting period			4 years
Compensation expense recognized, net of forfeiture activity, estimated annual percentage			4.00%
Compensation expense					$ 30,800,000	$ 30,800,000			$ 0	$ 0	$ 0	$ 0
Earnings Per Share, Basic and Diluted																$ (0.02)