Debt instrument principle including make-whole premium.

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- Definition

Debt instrument redemption price percentage on change of control.

+ References

No definition available.

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Debt instrument redemption price percentage on change of control, description.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

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

+ References

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- Definition

Date the debt instrument was issued, in YYYY-MM-DD format.

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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

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

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- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

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- Definition

Description of debt redemption features under terms of the debt agreement.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

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

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Long-Term Debt - Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands								3 Months Ended		12 Months Ended
	Dec. 16, 2019	Nov. 15, 2019	Sep. 25, 2019	Mar. 27, 2018	Jan. 19, 2018	Jun. 14, 2012	Oct. 05, 2010	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Gain loss on early extinguishment										$ 0	$ 3,596	$ (24,023)
Interest expense related to amortization of debt issuance costs										$ 1,000	$ 1,100	2,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayment of borrowings					$ 239,000
4.97% Series A Senior Notes, Due October 5th 2020
Debt Instrument [Line Items]
Notes issuance date							Oct. 05, 2010
Long-term debt, aggregate principal amount							$ 300,000
Debt interest rate							4.97%
Debt Instrument principle including make-whole premium			$ 308,000
Debt instrument, redemption percentage			100.00%
Gain loss on early extinguishment									$ (8,200)
Debt issuance costs							$ 1,900
Interest expense related to amortization of debt issuance costs												200
Series B Senior Notes Four Point Two Seven Percent Due June Fourteen Twenty Twenty Two
Debt Instrument [Line Items]
Notes issuance date						Jun. 14, 2012
Long-term debt, aggregate principal amount						$ 300,000
Debt interest rate						4.27%
Debt Instrument principle including make-whole premium	$ 315,000
Debt instrument, redemption percentage	100.00%
Gain loss on early extinguishment								$ (15,800)
Debt maturity date						Jun. 14, 2022
Debt issuance costs						$ 1,600
Interest expense related to amortization of debt issuance costs												400
3.95% Senior Notes Due 2028
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount					$ 525,000
Debt interest rate					3.95%					3.95%	5.15%
Debt instrument, redemption percentage					100.00%
Proceeds from borrowings under revolving credit facility					$ 521,000
Debt payment term										We pay interest on the 2028 Notes on February 1 and August 1 of each year
Debt maturity date					Feb. 01, 2028
Debt instrument redemption description										At our option, we may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, at our option, we may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date.
Debt instrument redemption upon the occurrence of change of control, description										Upon the occurrence of a change of control triggering event, as defined in the indentures, each holder of the Senior Notes may require us to purchase all or a portion of such holder’s Senior Notes at a price equal to 101% of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.
Redemption price percentage of principal amount of debt instrument on change of control					101.00%
Debt issuance costs					$ 1,600
5.15% Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount		$ 350,000
Debt interest rate		5.15%								5.15%	5.15%
Debt instrument, redemption percentage					100.00%
Proceeds from borrowings under revolving credit facility		$ 347,000
Debt payment term										We pay interest on the 2029 Notes on May 15 and November 15 of each year.
Debt maturity date		Nov. 15, 2029
Debt instrument redemption description										At our option, we may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, at our option, we may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date.
Debt issuance costs		$ 1,000
Term Loan Agreement
Debt Instrument [Line Items]
Repayment of borrowings		$ 50,000
Debt issuance costs								$ 200				200
Interest expense related to amortization of debt issuance costs												$ 100
Credit Agreement
Debt Instrument [Line Items]
Debt issuance costs													$ 4,600
Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt maturity date				Mar. 27, 2023
Amendment No. 2
Debt Instrument [Line Items]
Debt issuance costs											$ 400
2028 Notes
Debt Instrument [Line Items]
Gain loss on early extinguishment											3,400
Debt instrument, repurchase amount											15,500
2029 Notes
Debt Instrument [Line Items]
Gain loss on early extinguishment											200
Debt instrument, repurchase amount											800
Early Redemption Of2028 Notes And2029 Notes
Debt Instrument [Line Items]
Interest expense related to amortization of debt issuance costs											$ 100