Variable Interest Entity Arrangements - Carrying Values of Assets and Liabilities of Subsidiary in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 2,198,169	$ 3,685,618	$ 2,665,673	$ 3,367,914
Restricted cash	130,950	192,551	120,194	155,323
Accounts receivable, net	1,046,945	949,022
Prepaid expenses and other current assets	464,908	365,671
Total current assets	7,677,822	8,306,308
Non-current assets
Restricted cash, net of current portion	353,679	398,219	$ 433,841	$ 441,722
Other assets	801,867	571,657
Total assets	28,912,524	29,739,614
Current liabilities
Accounts payable	3,248,827	3,404,451
Accrued liabilities and other	2,276,951	2,094,253
Deferred revenue	762,810	630,292
Current portion of long-term debt and finance leases	1,705,711	2,567,699
Total current liabilities	9,242,800	9,992,136
Deferred revenue, net of current portion	1,157,343	990,873
Long-term debt and finance leases, net of current portion	9,787,950	9,403,672
Other long-term liabilities	2,475,135	2,710,403
Operating Lease Vehicles [Member]
Non-current assets
Operating lease net	1,972,502	2,089,758
Solar Energy Systems [Member]
Non-current assets
Solar energy systems, net	6,241,637	6,271,396
Variable Interest Entities (“VIEs”) [Member]
Current assets
Cash and cash equivalents	68,204	75,203
Restricted cash	70,705	130,927
Accounts receivable, net	29,647	18,702
Prepaid expenses and other current assets	9,038	10,262
Total current assets	177,594	235,094
Non-current assets
Restricted cash, net of current portion	60,444	65,262
Other assets	58,098	55,554
Total assets	5,608,886	5,628,077
Current liabilities
Accounts payable		32
Accrued liabilities and other	89,156	132,774
Deferred revenue	25,735	21,345
Current portion of long-term debt and finance leases	678,644	662,988
Total current liabilities	793,535	817,139
Deferred revenue, net of current portion	182,374	177,451
Long-term debt and finance leases, net of current portion	1,170,357	1,237,707
Other long-term liabilities	24,358	26,400
Total liabilities	2,170,624	2,258,697
Variable Interest Entities (“VIEs”) [Member] | Operating Lease Vehicles [Member]
Non-current assets
Operating lease net	199,842	155,439
Variable Interest Entities (“VIEs”) [Member] | Solar Energy Systems [Member]
Non-current assets
Solar energy systems, net	$ 5,112,908	$ 5,116,728