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Leases - Schedule of Future Minimum Lease Payments under Capital Leases and Operating Leases for Continuing Operations and Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]  
Capital Leases, 2013 $ 214
Capital Leases, 2014   
Capital Leases, 2015   
Capital Leases, 2016   
Capital Leases, 2017   
Capital Leases, 2018 and thereafter   
Capital Leases, Total 214
Less-Portion representing interest at annual rates of 6.25% (3)
Capital Leases, Principal 211
Capital leases and operating leases, 2013 116,477
Capital leases and operating leases, 2014 111,210
Capital leases and operating leases, 2015 98,860
Capital leases and operating leases, 2016 82,014
Capital leases and operating leases, 2017 69,050
Capital leases and operating leases, 2018 and thereafter 162,018
Capital leases and operating leases, Total 639,629
Continuing Operations [Member]
 
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]  
Operating Leases, 2013 103,010
Operating Leases, 2014 97,597
Operating Leases, 2015 86,132
Operating Leases, 2016 71,801
Operating Leases, 2017 59,038
Operating Leases, 2018 and thereafter 157,349
Operating Leases, Total 574,927
Discontinued Operations [Member]
 
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]  
Operating Leases, 2013 13,253
Operating Leases, 2014 13,613
Operating Leases, 2015 12,728
Operating Leases, 2016 10,213
Operating Leases, 2017 10,012
Operating Leases, 2018 and thereafter 4,669
Operating Leases, Total $ 64,488