The Company and Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Building improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Furniture, fixtures and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Furniture, fixtures and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	Useful life or remaining lease term, whichever is shorter