Significant Customers - Schedule of Percentage of Net Sales and Net Accounts Receivable Due from Customers (Detail) (Customer Concentration Risk [Member])	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%		100.00%
BMW [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	17.00%
BMW [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%		11.00%
Fiat Chrysler Automobiles [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	13.00%
Fiat Chrysler Automobiles [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%		13.00%
Audi/Volkswagen [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	12.00%
Audi/Volkswagen [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	5.00%		7.00%
Other Customers [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	59.00%	58.00%
Other Customers [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	71.00%		69.00%