Nature of Operations (Details)	6 Months Ended
	Jun. 30, 2011
Nature of Operations (Textuals) [Abstract]
Number of actively marketed land drilling rigs	551
Minimum company's ownership interest in joint venture	49.00%
Maximum company's ownership interest in oil and gas joint venture	50.00%
Number of rigs actively markets joint venture in Saudi Arabia	9
U.S. [Member]
Nature of Operations [Line Items]
Number of rigs marketing for land well-servicing and workover work	574
Number of platform rigs actively marketed	40
Number of jack-up rigs actively marketed	13
Number of barge rigs actively marketed	4
Number of hydraulic horsepower pressure pumping services in key basins throughout USA	616,000
Canada [Member]
Nature of Operations [Line Items]
Number of rigs marketing for land well-servicing and workover work	174
Joint Venture in Saudi Arabia [Member]
Nature of Operations [Line Items]
Company's ownership interest in joint venture with Saudi Arabia	51.00%