Annual report pursuant to Section 13 and 15(d)

Schedule of Reconciliation of Approved Costs and Amounts for Payments to Hurricanes, Included in Operating Lease Expense (Detail)

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Schedule of Reconciliation of Approved Costs and Amounts for Payments to Hurricanes, Included in Operating Lease Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Business Interruption Loss [Line Items]      
Incurred and reversals of accruals $ 1,022 $ 132 $ (1,380)
Plus amounts returned to insurers   1,241  
Less amounts approved for payment by insurers (146) (1,334) (10,350)
Included in lease operating expenses $ 876 $ 39 $ (11,730)