Annual report pursuant to Section 13 and 15(d)

Estimated Useful Lives of Property, Plant and Equipment (Detail)

v3.8.0.1
Estimated Useful Lives of Property, Plant and Equipment (Detail)
 12 Months Ended
Dec. 31, 2017
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