Major Customers Data as Percentage of Total Revenues (Detail) (Revenue [Member], Customer Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Customer A
Revenue, Major Customer [Line Items]
Percentage of total revenues	28.00%		24.00%	17.00%
Customer B
Revenue, Major Customer [Line Items]
Percentage of total revenues	11.00%		13.00%	16.00%
Customer C
Revenue, Major Customer [Line Items]
Percentage of total revenues		[1]	12.00%	12.00%

[1] Less than 10%