Related Parties - Dry Leasing Joint Venture - Additional Information (Details) - Dry Leasing Joint Venture [Member] - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2020
Related Party Transaction [Line Items]
Voting interest	10.00%
Investment in joint venture	$ 1,500,000	$ 500,000	$ 500,000
Capital contributions		0	0
Accounts receivable from joint venture		1,300,000	1,300,000
Service fee income		0	0
Maximum [Member]
Related Party Transaction [Line Items]
Commitment to capital contributions		$ 40,000,000.0	$ 40,000,000.0