Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives description	Shorter of the lease term or the estimated useful life
Building improvements and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives description	Estimated useful life
Minimum [Member] | Computer equipment and related software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Minimum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Maximum [Member] | Computer equipment and related software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	32 years
Maximum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years