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Summary of Significant Accounting Policies - Property and Equipment at Cost Using Straight-Line Method (Detail)
12 Months Ended
Dec. 31, 2019
Buildings and leasehold improvements [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 3 years
Buildings and leasehold improvements [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 40 years
Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 3 years
Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 10 years
Furniture and fixtures [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 5 years
Furniture and fixtures [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 10 years
Transportation equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 3 years
Transportation equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life, Years 20 years