Significant Impact of Customers on Company Segments (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asia Pacific | Exxon Mobil Corporation
Segment Reporting Information [Line Items]
Percentage of consolidated revenue		24.00%	36.00%
Asia Pacific | BHP Billiton Petroleum Pty Ltd
Segment Reporting Information [Line Items]
Percentage of consolidated revenue		10.00%
Asia Pacific | Chevron Corporation
Segment Reporting Information [Line Items]
Percentage of consolidated revenue			10.00%
Middle East
Segment Reporting Information [Line Items]
Percentage of consolidated revenue	13.00%
Middle East | Saudi Aramco
Segment Reporting Information [Line Items]
Percentage of consolidated revenue	25.00%	22.00%	24.00%