Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 4,002,231	$ 7,410,982
Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	270,142	533,554
Sales and Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	3,622,609	6,745,797
Automotive [Member] | Automotive Sales without Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	2,698,239	4,880,753
Automotive [Member] | Automotive Sales with Resale Value Guarantee [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	365,616	664,654
Automotive [Member] | Automative Regulatory Credits [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	54,010	134,339
Automotive [Member] | Automotive Leasing [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	239,816	413,252
Energy Generation and Storage [Member] | Energy Generation and Storage Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	234,602	532,497
Energy Generation and Storage [Member] | Energy Generation and Storage Leasing [Member]
Disaggregation Of Revenue [Line Items]
Total revenues	$ 139,806	$ 251,933