Future Minimum Lease Commitments under Non-Cancelable Operating Leases and Minimum Rentals to be Received under Non-Cancelable Subleases (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Operating Leases
2012 (remaining three months)	$ 10,696
2013	41,775
2014	37,365
2015	27,541
2016	18,949
Thereafter	55,069
Total minimum lease payments	191,395
Sublease Income
2012 (remaining three months)	(450)
2013	(1,734)
2014	(1,590)
2015	(1,776)
2016	(2,927)
Thereafter	(12,966)
Total minimum lease payments	$ (21,443)

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