Drilling and Other Property and Equipment (Tables)

9 Months Ended

Sep. 30, 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:

	September 30,			December 31,
	2013			2012
	(In thousands)
Drilling rigs and equipment	$	7,295,964		$	7,107,279
Construction work-in-progress		1,553,430			990,964
Land and buildings		65,362			64,296
Office equipment and other		64,891			60,239
Cost		8,979,647			8,222,778
Less: accumulated depreciation		(3,648,177	)		(3,357,806	)
Drilling and other property and equipment, net	$	5,331,470		$	4,864,972

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

Construction work-in-progress, including capitalized interest, at September 30, 2013 and December 31, 2012 is summarized as follows:

	September 30,		December 31,
	2013		2012
	(In thousands)
Ultra-deepwater drillships	$	834,476	$	741,059
Ultra-deepwater semisubmersible:
Ocean GreatWhite		192,311		—
Deepwater semisubmersibles:
Ocean Onyx		299,886		167,403
Ocean Apex		226,757		82,502
Total construction work-in-progress	$	1,553,430	$	990,964