Information about Segment Assets by Country (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total assets	$ 3,157,281	$ 3,333,627
Asia Pacific
Segment Reporting Information [Line Items]
Assets, continuing operations	1,171,837	1,402,923
Atlantic
Segment Reporting Information [Line Items]
Assets, continuing operations	611,111	536,734
Middle East
Segment Reporting Information [Line Items]
Assets, continuing operations	1,228,812	1,006,284
Corporate and Other
Segment Reporting Information [Line Items]
Assets, continuing operations	$ 145,521	$ 387,686