Discontinued Operations - Changes In Future Remaining Lease Obligations Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease expiration year					2019
Balance, Beginning of Period	$ 41,215		$ 43,895		$ 45,837		$ 50,378
Charges Incurred	2,543	[1]	491	[1]	3,256	[1]	1,310	[1]
Net Cash Payments	(2,503)		(2,450)		(7,838)		(8,284)
Other							(1,468)	[2]
Balance, End of Period	$ 41,255		$ 41,936		$ 41,255		$ 41,936

[1] Includes charges for newly vacated spaces and subsequent adjustments for accretion, revised estimates, and variances between estimated and actual charges, net of any reversals for terminated lease obligations.

[2] Includes existing prepaid rent balances for newly vacated spaces that are netted with the losses incurred in the period recorded.