Significant Customers - Schedule of Percentage of Net Sales and Net Accounts Receivable Due from Customers (Detail)	6 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013
Significant Customers [Line Items]
Percentage of net sales to customers	100.00%	100.00%
Percentage of net accounts receivable due from customers	100.00%		100.00%
BMW [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	17.00%	20.00%
Percentage of net accounts receivable due from customers	10.00%		12.00%
Chrysler [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	13.00%	8.00%
Percentage of net accounts receivable due from customers	14.00%		12.00%
Audi/Volkswagen [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	12.00%	13.00%
Percentage of net accounts receivable due from customers	6.00%		9.00%
Toyota [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	9.00%	10.00%
Percentage of net accounts receivable due from customers	5.00%		6.00%
Other Customers [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	49.00%	49.00%
Percentage of net accounts receivable due from customers	65.00%		61.00%