Net Income Per Share Attributable to Cooper-Standard Holdings Inc -Common stock equivalents (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	145,900	161,000	145,900	464,504
Stock Option [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price	$ 64.74	$ 64.74	$ 64.74	$ 25.52
Stock Option [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price	$ 70.20	$ 70.20	$ 70.2	$ 70.20
Restricted Stock [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	42,717