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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Balance, Beginning of Period $ 45,961 $ 50,827 $ 71,714
Charges Incurred 7,371 [1] 7,636 [1] 6,527 [1]
Net Cash Payments (11,055) [2] (11,035) [2] (27,952) [2]
Other    [3] (1,467) [3] 538 [3]
Balance, End of Period $ 42,277 $ 45,961 $ 50,827
[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] See Note 9 "Leases" of the notes to our consolidated financial statements for the future minimum lease payments under operating leases for discontinued operations as of December 31, 2012.
[3] Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that are netted with the losses incurred in the period recorded.