Restructuring Costs of Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring cost	$ 1,236	$ 227
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring cost	154
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring cost	$ 1,082	$ 227