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Long-Term Debt - Schedule of Long-Term Debt Interest Rate (Detail)	12 Months Ended
	Dec. 31, 2015
Less than .25 to 1 | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.25
Greater than or equal to .25 to 1 but less than .50 to 1 | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.25
Greater than or equal to .25 to 1 but less than .50 to 1 | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.5
Greater than or equal to .50 to 1 but less than .75 to 1 | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.5
Greater than or equal to .50 to 1 but less than .75 to 1 | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.75
Greater than or equal to .75 to 1 but less than .90 to 1 | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.75
Greater than or equal to .75 to 1 but less than .90 to 1 | Maximum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.9
Greater than or equal to .90 to 1 | Minimum
Debt Instrument [Line Items]
Ratio of total outstanding borrowings to borrowing base	0.9
LIBOR | Less than .25 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	1.50%
LIBOR | Greater than or equal to .25 to 1 but less than .50 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	1.75%
LIBOR | Greater than or equal to .50 to 1 but less than .75 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	2.00%
LIBOR | Greater than or equal to .75 to 1 but less than .90 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	2.25%
LIBOR | Greater than or equal to .90 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	2.50%
ABR | Less than .25 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	0.00%
ABR | Greater than or equal to .25 to 1 but less than .50 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	0.25%
ABR | Greater than or equal to .50 to 1 but less than .75 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	0.50%
ABR | Greater than or equal to .75 to 1 but less than .90 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	0.75%
ABR | Greater than or equal to .90 to 1
Debt Instrument [Line Items]
Debt instrument interest rate terms, in percentage	1.00%

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Ratio of total outstanding borrowings to borrowing base.

+ 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

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- Definition

The effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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