Redeemable Noncontrolling Interests (Details) - fund	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Abstract]
Number of funds, carrying value adjusted to redemption value	6	6

Number of Funds, Carrying Value Adjusted to Redemption Value

No definition available.

Name:	run_NumberofFundsCarryingValueAdjustedtoRedemptionValue
Namespace Prefix:	run_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant