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Leases - Schedule of Cost Basis and Accumulated Depreciation of Assets Recorded under Capital Leases from Continuing Operating Activities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Leases [Line Items]    
Cost $ 9,224 $ 9,143
Accumulated depreciation (6,993) (6,691)
Net book value $ 2,231 $ 2,452