Estimated Useful Life of Assets (Detail)	12 Months Ended
	Dec. 31, 2020
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Shorter of the term of the lease or estimated useful life
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	12 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Furniture Fixtures And Office Equipment Member [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	8 years
Furniture Fixtures And Office Equipment Member [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Computer Hardware And Software member [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Computer Hardware And Software member [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years