Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2016
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	Lesser of life of lease or economic life
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years