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Member Receivables, Net - Summary of Aging of Member Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	$ 408,748	$ 334,948
Less Coastal-held ExtraCash Receivables	(158,815)
Gross Member Receivables Net	249,933
Allowance for Credit Losses	(51,778)	(37,641)
Less Coastal-held ExtraCash Receivables	6,432
Allowance for Credit Losses Net	(45,346)	(37,641)	$ (40,217)	$ (22,703)
Gross Member Receivables, Net	356,970	297,307
Less Coastal-held ExtraCash Receivables	(152,383)
Member Receivables, Net	204,587
1-10 [Member]
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	271,008	242,091
Allowance for Credit Losses	(3,936)	(3,006)
Gross Member Receivables, Net	267,072	239,085
11-30 [Member]
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	91,191	56,897
Allowance for Credit Losses	(13,094)	(8,851)
Gross Member Receivables, Net	78,097	48,046
31-60 [Member]
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	17,319	13,093
Allowance for Credit Losses	(10,966)	(7,942)
Gross Member Receivables, Net	6,353	5,151
61-90 [Member]
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	15,171	11,893
Allowance for Credit Losses	(11,894)	(8,888)
Gross Member Receivables, Net	3,277	3,005
91-120 [Member]
Financing Receivable, Past Due [Line Items]
Gross Member Receivables	14,059	10,974
Allowance for Credit Losses	(11,888)	(8,954)
Gross Member Receivables, Net	$ 2,171	$ 2,020