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Leases - Schedule of Changes in Future Minimum Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Line Items]      
Balance, Beginning of Period $ 12,831 $ 17,770 $ 19,609
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 13,262 12,831 17,770
Continuing Operations [Member]
      
Leases [Line Items]      
Charges Incurred 4,249 [4] 1,313 [4] 4,364 [4]
Net Cash Payments (3,818) (6,544) (6,115)
Other   $ 292 [3],[5] $ (88) [3],[5]
[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.
[4] 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.
[5] Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that offset the losses incurred in the period recorded.