Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)	9 Months Ended
	Sep. 30, 2014
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	2 years
Minimum | Land improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Minimum | Computer hardware
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Minimum | Software
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	3 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	20 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	11 years
Maximum | Land improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	21 years
Maximum | Computer hardware
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Maximum | Software
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years