Significant Customers - Schedule of Percentage of Net Sales and Net Accounts Receivable Due from Customers (Detail) - Customer Concentration Risk [Member]	3 Months Ended			6 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%		100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | BMW [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%		16.00%	13.00%	16.00%
Sales Revenue, Net [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%		14.00%	14.00%	14.00%
Sales Revenue, Net [Member] | The Volkswagen Group [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%		11.00%	11.00%	11.00%
Sales Revenue, Net [Member] | Other Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	65.00%		59.00%	62.00%	59.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Accounts Receivable [Member] | BMW [Member]
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	9.00%
Accounts Receivable [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	14.00%
Accounts Receivable [Member] | The Volkswagen Group [Member]
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	7.00%
Accounts Receivable [Member] | Other Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	74.00%	70.00%