Commitments and Contingencies - Annual Future Minimum Payments Under Operating Leases / Facility Exit Obligation (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Annual future minimum payments under these operating leases
2013	$ 20,111
2014	20,618
2015	17,053
2016	15,424
2017	14,412
Thereafter	51,950
Total minimum lease payments	139,568
Data Centers [Member]
Annual future minimum payments under these operating leases
2013	9,797
2014	6,989
2015	2,831
2016	670
2017	636
Thereafter	680
Total minimum lease payments	21,603
Leasehold Improvements [Member]
Annual future minimum payments under these operating leases
2013	10,314
2014	13,629
2015	14,222
2016	14,754
2017	13,776
Thereafter	51,270
Total minimum lease payments	$ 117,965