Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2020
Building
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	30 years
Leasehold Improvements | Minimum
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	3 years
Leasehold Improvements | Maximum
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	5 years
Equipment and Computers | Minimum
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	3 years
Equipment and Computers | Maximum
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	5 years
Furniture and Fixtures
Property Plant And Equipment Disclosure [Line Items]
Property, plant, and equipment, useful lives	5 years