Parker Wellbore Quarterly report pursuant to Section 13 or 15(d)

Income Tax Benefit/Expense - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 9,112,000	$ 6,695,000	$ 18,841,000	$ 31,155,000
Reduction in pre-tax earnings (loss)	17,230,000	17,526,000	35,905,000	88,420,000
Proceeds from income tax refunds			22,400,000
Interest from income tax refunds			$ 2,200,000

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.