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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, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 27, 2012
Debt Instrument [Line Items]
Gain (Loss) on early extinguishment											$ 3,596	$ (24,023)
Repayment of borrowings													$ 347,000
Proceeds from borrowings, before offering expenses													79,000
Interest expense related to amortization of debt issuance costs											1,100	$ 2,000	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]
Long-term debt, aggregate principal amount							$ 300,000
Debt interest rate							4.97%
Notes issuance date							Oct. 05, 2010
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
4.27% Series B Senior Notes, Due June 14th 2022
Debt Instrument [Line Items]
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%
Debt maturity date						Jun. 14, 2012
Gain (Loss) on early extinguishment									$ (15,800)
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%	3.95%		3.95%	3.95%
Debt instrument, redemption percentage					100.00%
Debt maturity date					Feb. 01, 2028
Proceeds from borrowings, before offering expenses					$ 521,000
Debt payment term											We pay interest on the 2028 Notes on February 1 and August 1 of each year.
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%		5.15%	5.15%
Debt maturity date		Nov. 15, 2029
Proceeds from borrowings, before offering expenses		$ 347,000
Debt payment term											We pay interest on the 2029 Notes on May 15 and November 15 of each year.
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
2028 Notes
Debt Instrument [Line Items]
Gain (Loss) on early extinguishment								3,400
Debt instrument, repurchase amount								15,500			15,500
2029 Notes
Debt Instrument [Line Items]
Gain (Loss) on early extinguishment								200
Debt instrument, repurchase amount								800			800
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
Previous Credit Agreement
Debt Instrument [Line Items]
Interest expense related to amortization of debt issuance costs													$ 300
Amendment No. 2
Debt Instrument [Line Items]
Debt issuance costs								$ 400			400
Early redemption of 2028 Notes and 2029 Notes
Debt Instrument [Line Items]
Interest expense related to amortization of debt issuance costs											$ 100

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