Fixed charge coverage ratio.

No definition available.

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Period Type:	duration

- Definition

Funded indebtedness to EBITDA Ratio

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of credit facility maximum borrowing capacity subject to certain conditions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
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-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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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
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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Balance Type:	credit
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- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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Balance Type:
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Long-Term Debt, Net - Additional Information (Detail) - USD ($)				9 Months Ended
	Apr. 15, 2019	Feb. 12, 2018	Dec. 07, 2017	Sep. 30, 2019	Dec. 31, 2018
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, restrictive covenants				maintain a fixed charge coverage ratio of not less than 1.25 to 1.0 and a funded indebtedness to EBITDA ratio of not greater than 2.0 to 1.0
Line of credit facility agreement date		Feb. 12, 2018
Line of credit facility, maximum borrowing capacity		$ 50,000,000.0
Line of credit facility, maximum borrwoing capacity may increased subject to obtaining additional lender commitments and certain approvals and other conditions		$ 100,000,000.0
Line of credit facility, maturity date		Feb. 12, 2020
Line of credit facility, interest rate description				Borrowings under the Facility will generally bear interest at a prime rate plus 1.0% or, at our option, an adjusted LIBOR rate for the interest period in effect for such borrowing plus 1.5%.
Line of credit facility, borrowings outstanding				$ 0
Revolving Credit Agreement [Member] \| Wells Fargo Bank, N.A. [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 75,000,000.0
Line of credit facility, maximum borrwoing capacity may increased subject to obtaining additional lender commitments and certain approvals and other conditions	$ 125,000,000.0
Line of credit facility, maturity date	Apr. 15, 2022
Revolving Credit Agreement [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 5,000,000.0
Revolving Credit Agreement [Member] \| Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,500,000
Revolving Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio required by covenants				125.00%
Revolving Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Funded indebtedness to EBITDA ratio required by covenants				100.00%
Revolving Credit Agreement [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, outstanding borrowings interest				1.00%
Revolving Credit Agreement [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Line of credit facility, outstanding borrowings interest				1.50%
New Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, restrictive covenants				maintain a fixed charge coverage ratio of not less than 1.25 to 1.0 and a funded indebtedness to EBITDA ratio of not greater than 2.0 to 1.0.
New Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio required by covenants				125.00%
New Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Funded indebtedness to EBITDA ratio required by covenants				100.00%
New Credit Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument maturity date			Sep. 07, 2025
Term loan, maturity date description				The Term Loans mature on September 7, 2025 and bear interest, at our option, at either (a) a prime rate plus 1.0% or (b) an adjusted LIBOR rate for the interest period in effect for such Term Loan plus 1.5%.
New Credit Agreement [Member] \| Term Loan [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate			1.00%
New Credit Agreement [Member] \| Term Loan [Member] \| Adjusted London Interbank Offered Rate LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate			1.50%
New Credit Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Indebtedness, term loans				$ 31,300,000
Unamortized debt issuance cost				$ 200,000	$ 200,000