Segment Reporting - Information about Segment Assets by Country (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 3,527,316	$ 2,807,371
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	777,686	1,030,823
Middle East [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	1,066,934	1,129,529
Americas [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	778,713	522,713
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets, continuing operations	$ 903,983	$ 124,306