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Other Income and Expense - Additional Information (Detail) (USD $)
In Thousands
3 Months Ended9 Months Ended3 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
IROC Energy Services Corporation
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]     
Equity Method Investments, gain on sale$ 0$ 0$ 4,783$ 0$ 4,800