Segment Information - Summary of Revenues on Percentage Basis by Geographic Regions (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	100.00%	100.00%	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	67.00%	72.00%	65.00%	75.00%
South America [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	11.00%		13.00%
Japan [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	2.00%	7.00%	2.00%	6.00%
Europe [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	19.00%	17.00%	19.00%	15.00%
Other [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic regions, based on the country	1.00%	4.00%	1.00%	4.00%