Drilling and Other Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property Plant And Equipment [Abstract]

Summary of Cost and Accumulated Depreciation of Drilling and Other Property and Equipment

Cost and accumulated depreciation of drilling and other property and equipment are summarized as follows:

	December 31,
	2013			2012
	(In thousands)
Drilling rigs and equipment	$	7,412,066		$	7,107,279
Construction work-in-progress		1,668,211			990,964
Land and buildings		65,627			64,296
Office equipment and other		65,799			60,239
Cost		9,211,703			8,222,778
Less accumulated depreciation		(3,744,476	)		(3,357,806	)
Drilling and other property and equipment, net	$	5,467,227		$	4,864,972

Summary of Construction Work-in-Progress, Including Capitalized Interest

Construction work-in-progress, including capitalized interest, at December 31, 2013 and 2012 is summarized as follows:

	December 31,
	2013		2012
	(In thousands)
Ultra-deepwater drillships	$	868,908	$	741,059
Ultra-deepwater semisubmersible:
Ocean GreatWhite		195,578		—
Deepwater semisubmersibles:
Ocean Onyx		339,129		167,403
Ocean Apex		264,596		82,502
Total construction work-in-progress	$	1,668,211	$	990,964