Debt - Schedule of Maturities of Principal Amounts of Debt Obligations (Details) - USD ($)		1 Months Ended	9 Months Ended
	Oct. 22, 2018	Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Three months ended December 31, 2018			$ 4,000,000
2019			27,687,855
2020			23,750,285
2021			23,750,285
2022			250,611,575
Long-term debt			329,800,000
Norwegian Bond Debt Facility
Debt Instrument [Line Items]
Three months ended December 31, 2018			4,000,000
2019			8,000,000
2020			8,000,000
2021			8,000,000
2022			172,000,000
Long-term debt			200,000,000
New First Lien Facility
Debt Instrument [Line Items]
Three months ended December 31, 2018			0
2019			10,750,000
2020			8,600,000
2021			8,600,000
2022			32,050,000
Long-term debt			60,000,000
Ultraco Debt Facility
Debt Instrument [Line Items]
Three months ended December 31, 2018			0
2019			8,937,855
2020			7,150,285
2021			7,150,285
2022			46,561,575
Long-term debt			69,800,000
Proceeds from issuance of long-term debt			8,600,000	$ 61,200,000
Ultraco Lenders | Ultraco Debt Facility
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		$ 8,600,000	$ 69,800,000
Ultraco Lenders | Subsequent Event | Ultraco Debt Facility
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 12,800,000