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

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ 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.

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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

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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 carrying value as of the balance sheet date of the noncurrent portion 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.

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REVOLVING LINE OF CREDIT (Detail) - USD ($)		12 Months Ended
REVOLVING LINE OF CREDIT (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Line Of Credit Facility [Line Items]
Outstanding borrowings		$ 0	$ 0
Letter of credit outstanding		2,000,000
Credit Agreement
Line Of Credit Facility [Line Items]
Interest paid		$ 610,000	$ 1,750,000	$ 770,000
Revolving Credit Facility \| Credit Agreement
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 400,000,000
Debt instrument, interest rate, stated percentage		3.38%
Outstanding borrowings		$ 0
Line of credit facility, unused borrowing capacity		$ 400,000,000
Revolving Credit Facility \| Credit Agreement \| LIBOR Rate
Line Of Credit Facility [Line Items]
Debt instrument, interest rate, effective percentage		1.27%
Revolving Credit Facility \| Credit Agreement \| Minimum \| Prime Commercial Lending Rate
Line Of Credit Facility [Line Items]
Line of credit facility interest rate (in percent)	0.125%
Revolving Credit Facility \| Credit Agreement \| Minimum \| LIBOR Rate
Line Of Credit Facility [Line Items]
Line of credit facility interest rate (in percent)	1.125%
Revolving Credit Facility \| Credit Agreement \| Maximum \| Prime Commercial Lending Rate
Line Of Credit Facility [Line Items]
Line of credit facility interest rate (in percent)	0.75%
Revolving Credit Facility \| Credit Agreement \| Maximum \| LIBOR Rate
Line Of Credit Facility [Line Items]
Line of credit facility interest rate (in percent)	1.75%
Letter of Credit \| Revolving Credit Facility \| Credit Agreement
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 25,000,000