Commitments and Contingencies - Future Minimum Rental Payments under Non-Cancelable Operating Leases and Future Minimum Receipts under Subleases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Terms Of One Year Or More [Line Items]
Operating lease obligations, Total	$ 637,980
Sublease receipts, Total	(277,390)
Total net lease obligations, Total	360,590
Operating lease obligations, YE 2013	44,101
Sublease receipts, YE 2013	(14,562)
Total net lease obligations, YE 2013	29,539
Operating lease obligations, YE 2014	47,471
Sublease receipts, YE 2014	(17,591)
Total net lease obligations, YE 2014	29,880
Operating lease obligations, YE 2015	47,300
Sublease receipts, YE 2015	(19,178)
Total net lease obligations, YE 2015	28,122
Operating lease obligations, YE 2016	47,535
Sublease receipts, YE 2016	(19,638)
Total net lease obligations, YE 2016	27,897
Operating lease obligations, YE 2017	46,032
Sublease receipts, YE 2017	(20,111)
Total net lease obligations, YE 2017	25,921
Operating lease obligations, Thereafter	405,541
Sublease receipts, Thereafter	(186,310)
Total net lease obligations, Thereafter	$ 219,231