Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Minimum | Building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	2 years
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	1 year
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	1 year
Minimum | Land Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	4 years
Minimum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	1 year
Maximum | Building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	23 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	10 years
Maximum | Land Improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	15 years
Maximum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years