Restructuring - Summary of Ongoing Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	$ 500		$ 768	$ 1,142	$ 800
Cost of Revenues
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred		$ 800	800
Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	200		300		100
Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	300		300		100
Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
China
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		200		0
Employee Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred			464	$ 36
Employee Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	100		200		100
Employee Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	200		200		100
Employee Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
Employee Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
Employee Costs | China
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		200
Employee Costs | Other Restructuring | Cost of Revenues
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		100		0
Employee Costs | Other Restructuring | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		100		0
Facility and Other Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	100		100		0
Facility and Other Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	100		100		0
Facility and Other Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		0
Facility and Other Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		0
Facility and Other Costs | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0		0		$ 0
Minimum
Restructuring Cost and Reserve [Line Items]
Total Expense			8,000
Expected Future Expense	6,400		6,400
Minimum | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			400
Expected Future Expense	0		0
Minimum | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			2,300
Expected Future Expense	1,900		1,900
Minimum | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			1,000
Expected Future Expense	800		800
Minimum | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			3,100
Expected Future Expense	2,900		2,900
Minimum | China
Restructuring Cost and Reserve [Line Items]
Total Expense			200
Expected Future Expense	0		0
Minimum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Expense			1,000
Expected Future Expense	800		800
Minimum | Employee Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			300
Expected Future Expense	0		0
Minimum | Employee Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			300
Expected Future Expense	0		0
Minimum | Employee Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			500
Expected Future Expense	300		300
Minimum | Employee Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			1,000
Expected Future Expense	800		800
Minimum | Employee Costs | China
Restructuring Cost and Reserve [Line Items]
Total Expense			200
Expected Future Expense	0		0
Minimum | Employee Costs | Other Restructuring | Cost of Revenues
Restructuring Cost and Reserve [Line Items]
Total Expense			300
Expected Future Expense	200		200
Minimum | Employee Costs | Other Restructuring | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total Expense			100
Expected Future Expense	0		0
Minimum | Facility and Other Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			100
Expected Future Expense	0		0
Minimum | Facility and Other Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			2,000
Expected Future Expense	1,900		1,900
Minimum | Facility and Other Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			500
Expected Future Expense	500		500
Minimum | Facility and Other Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			2,100
Expected Future Expense	2,100		2,100
Minimum | Facility and Other Costs | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Expense			600
Expected Future Expense	600		600
Maximum
Restructuring Cost and Reserve [Line Items]
Total Expense			11,000
Expected Future Expense	9,400		9,400
Maximum | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			400
Expected Future Expense	0		0
Maximum | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			3,000
Expected Future Expense	2,600		2,600
Maximum | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			1,300
Expected Future Expense	1,100		1,100
Maximum | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			3,800
Expected Future Expense	3,600		3,600
Maximum | China
Restructuring Cost and Reserve [Line Items]
Total Expense			200
Expected Future Expense	0		0
Maximum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Expense			2,300
Expected Future Expense	2,100		2,100
Maximum | Employee Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			300
Expected Future Expense	0		0
Maximum | Employee Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			500
Expected Future Expense	200		200
Maximum | Employee Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			700
Expected Future Expense	500		500
Maximum | Employee Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			1,300
Expected Future Expense	1,100		1,100
Maximum | Employee Costs | China
Restructuring Cost and Reserve [Line Items]
Total Expense			200
Expected Future Expense	0		0
Maximum | Employee Costs | Other Restructuring | Cost of Revenues
Restructuring Cost and Reserve [Line Items]
Total Expense			400
Expected Future Expense	300		300
Maximum | Employee Costs | Other Restructuring | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total Expense			100
Expected Future Expense	0		0
Maximum | Facility and Other Costs | Edgewood Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			100
Expected Future Expense	0		0
Maximum | Facility and Other Costs | Piedmont Seating
Restructuring Cost and Reserve [Line Items]
Total Expense			2,500
Expected Future Expense	2,400		2,400
Maximum | Facility and Other Costs | Monona Wire Harness
Restructuring Cost and Reserve [Line Items]
Total Expense			600
Expected Future Expense	600		600
Maximum | Facility and Other Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Total Expense			2,500
Expected Future Expense	2,500		2,500
Maximum | Facility and Other Costs | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Expense			1,800
Expected Future Expense	$ 1,800		$ 1,800