Geographic and Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Customer	Mar. 31, 2014 Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	1
Number of business lines	3
Customer Concentration Risk [Member] | Net Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		10.00%
Number of customers	2	0
Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	67.00%	55.00%
Number of customers	10	10
Customer Concentration Risk [Member] | Net Sales [Member] | Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.40%
Customer Concentration Risk [Member] | Net Sales [Member] | Customer Two [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.80%
Geographic Concentration Risk [Member] | Property, Plant and Equipment [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	96.00%