Schedule of Concentration Risk of Gross Accounts Receivable From Owned Fleet (Detail) - Accounts Receivable - Customer Concentration Risk	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Customer A
Concentration Risk [Line Items]
Percentage of lease rental income	11.30%	17.10%
Customer B
Concentration Risk [Line Items]
Percentage of lease rental income	16.10%	11.20%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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