Commitments and Contingencies - Annual Future Minimum Payments Under Operating Leases / Facility Exit Obligation (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Annual future minimum payments under these operating leases
2013	$ 13,725
2014	15,788
2015	11,574
2016	11,303
2017	11,473
Thereafter	47,427
Total minimum lease payments	111,290
Data Centers [Member]
Annual future minimum payments under these operating leases
2013	7,474
2014	5,127
2015	476
2016	0
2017	0
Thereafter	0
Total minimum lease payments	13,077
Leasehold Improvements [Member]
Annual future minimum payments under these operating leases
2013	6,251
2014	10,661
2015	11,098
2016	11,303
2017	11,473
Thereafter	47,427
Total minimum lease payments	$ 98,213