Summary of Significant Accounting Policies - Schedule of estimated useful lives of other intangible assets (Details)	12 Months Ended
	Dec. 31, 2015
Engineering drawings
Estimated useful lives of other intangible assets
Finite-lived intangible asset, useful life	15 years
Minimum | Patents
Estimated useful lives of other intangible assets
Finite-lived intangible asset, useful life	10 years
Minimum | Customer relationships
Estimated useful lives of other intangible assets
Finite-lived intangible asset, useful life	10 years
Maximum | Patents
Estimated useful lives of other intangible assets
Finite-lived intangible asset, useful life	20 years
Maximum | Customer relationships
Estimated useful lives of other intangible assets
Finite-lived intangible asset, useful life	20 years