Information about Segment Assets by Country (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total assets	$ 3,195,947	$ 3,333,627
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Assets, continuing operations	1,176,446	1,402,923
Operating Segments | Atlantic
Segment Reporting Information [Line Items]
Assets, continuing operations	561,633	536,734
Operating Segments | Middle East Project
Segment Reporting Information [Line Items]
Assets, continuing operations	1,262,792	1,006,284
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Assets, continuing operations	$ 195,076	$ 387,686