Long-term Debt - Narrative (Details)	9 Months Ended
Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Capital leases, term (months)	36 months
Revolving credit facility \| Line of credit
Debt Instrument [Line Items]
Long-term line of credit	$ 67,900,000
Line of credit facility, remaining borrowing capacity	$ 17,100,000
Borrowing limit based on eligible trade accounts (as a percent)	85.00%
Eligible trade accounts receivable days outstanding limit (not more than)	90 days
Borrowing limit based on appraised forced liquidation of eligible completed and owned drilling rigs (up to) (as a percent)	70.00%
Interest rate, basis spread based on availability (as a percent)	3.50%
Commitment fee on unused capacity (as a percent)	0.50%
Weighted average interest rate on borrowings (as a percent)	6.99%
Revolving credit facility \| Line of credit \| LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)	4.50%
Revolving credit facility \| Line of credit \| Three-month LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)	1.00%
Revolving credit facility \| Line of credit \| Federal funds, effective rate
Debt Instrument [Line Items]
Interest rate, basis spread (as a percent)	0.05%
Revolving credit facility \| Line of credit \| CIT Finance, LLC syndicate
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 85,000,000.0

Capital Lease Obligations, Term of Contract

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- Definition

Debt Instrument, Borrowing Limitations, Accounts Receivable Days Outstanding

+ References

No definition available.

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- Definition

Debt Instrument, Borrowing Limitations, Accounts Receivable Limitation

+ References

No definition available.

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- Definition

Debt Instrument, Borrowing Limitations On Rigs

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Variable Rate

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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