Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2011

Summary of Significant Accounting Policies [Abstract]

Change in the carrying amount of goodwill for various Contract Drilling segments and other Operating Segments

			Acquisitions
	Balance as of		and Purchase					Cumulative			Balance as of
	December 31,		Price					Translation			September 30,
	2010		Adjustments			Impairments		Adjustment			2011
	(In thousands)
Contract Drilling:
U.S. Lower 48 Land Drilling	$	30,154	$	—		$	—	$	—		$	30,154
U.S. Land Well-servicing		55,839		(767	)		—		—			55,072
U.S. Offshore		7,296		—			—		—			7,296
Alaska		19,995		—			—		—			19,995
International		18,983		—			—		—			18,983
Subtotal Contract Drilling		132,267		(767	)		—		—			131,500
Pressure Pumping		334,992		—			—		—			334,992
Other Operating Segments		27,113		8,386	(1)		—		(694	)		34,805
Total	$	494,372	$	7,619		$	—	$	(694	)	$	501,297