Commitments and Contingencies (Detail)	9 Months Ended
	Sep. 30, 2020 Agreement legal_matter
Loss Contingencies [Line Items]
Approximate number of federal district court actions alleged for patent infringement | legal_matter	25
Guarantee obligations, term	30 years
Number of agreements | Agreement	7
Payment Guarantee | Maximum
Loss Contingencies [Line Items]
Guarantee obligations, term	18 years
Payment Guarantee | Minimum
Loss Contingencies [Line Items]
Guarantee obligations, term	12 years