Summary of Significant Accounting Policies - Receivables (Details)	3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]
Financing receivable, non-accrual period (in days)	90 days
Reasonable forecast period (in years)	2 years

Threshold period past due for delinquent or nonaccrual of financing receivable.

No definition available.

Name:	hasi_ThresholdPeriodPastDueForDelinquentOrNonaccrualOfFinancingReceivable
Namespace Prefix:	hasi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration