Represents the variable interest rate floor.

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

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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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

Amount of the required periodic payments applied to principal.

+ References

+ Details

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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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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Period Type:	instant

- Definition

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

+ References

+ Details

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Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

+ Details

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Debt - Additional Information (Detail) - USD ($)	12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2013	Dec. 31, 2012	Apr. 16, 2010
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 94,000	$ 178,000	$ 1,798,000
Excess cash flow payment	$ 7,320,000	14,627,000
2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument, interest rate	4.25%
2013 Senior Secured Credit Facility First amendment \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
2013 Senior Secured Credit Facility First amendment \| Alternative Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
2013 Senior Secured Credit Facility First amendment \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
2013 Senior Secured Credit Facility First amendment \| Eurodollar rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
2013 Senior Secured Credit Facility First amendment \| Eurodollar rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Secured credit facility \| 2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Loss on early extinguishment of debt, unamortized debt discount and issuance costs			1,664,000
Debt issuance costs			3,327,000
Unamortized debt discount			1,345,000
Debt Instrument, expense incurred			1,982,000
Loss on early extinguishment of debt	$ 94,000	178,000	134,000
Excess cash flow payment	12,727,000
Mandatory principal payments	520,000		$ 8,000,000
Secured credit facility \| 2013 Senior Secured Credit Facility First amendment
Debt Instrument [Line Items]
Debt issuance costs	1,086,000
Unamortized debt discount	555,000
Debt Instrument, expense incurred	531,000
Revolving loan facility \| 2010 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity						$ 10,000,000
Revolving loan facility \| 2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 10,000,000
Available borrowings under the facility	$ 0	0
Revolving loan facility commitment fee on average daily amount of unused portion	0.50%
LIBOR loans \| 2013 Senior Secured Credit Facility First amendment \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
LIBOR loans \| 2013 Senior Secured Credit Facility First amendment \| Minimum
Debt Instrument [Line Items]
Variable interest rate floor	1.00%
ABR loans \| 2013 Senior Secured Credit Facility First amendment \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Term loan \| 2010 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity						$ 215,000,000
Term loan \| 2010 Senior Secured Credit Facility Amendment
Debt Instrument [Line Items]
Credit facility, borrowing capacity					$ 45,000,000
Term loan \| 2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 230,000,000
Debt amendment costs recorded as unamortized debt discount	$ 751,000	$ 360,000
Mandatory principal payments	$ 520,000