Segment Information - Summary of Revenues on Percentage Basis by Geographic Region (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	100.00%	100.00%	100.00%
United States [Member]
Segment Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	84.00%	82.00%	83.00%
Japan [Member]
Segment Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	8.00%	15.00%	16.00%
Middle East [Member]
Segment Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	6.00%
Other [Member]
Segment Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	2.00%	3.00%	1.00%