Income Taxes - Summary of Components of Deferred and Other Tax Assets and Liabilities (Parenthetical) (Detail) - Medallion Chicago [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Income Tax Rate Reconciliation [Line Items]
Net operating loss carryforwards	$ 89,687
Net operating loss carryforwards expiration period	expires at various dates between December 31, 2026 and December 31, 2035
Net operating loss carryforwards assets	$ 22,145
December 31, 2016 To December 31, 2035 [Member]
Income Tax Rate Reconciliation [Line Items]
Net operating loss carryforwards	$ 1,712