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Long-Term Debt (Narrative) (Detail) - USD ($)	3 Months Ended	12 Months Ended
Long-Term Debt (Narrative) (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 20, 2021	Aug. 31, 2021	Mar. 13, 2020	Jan. 23, 2020	Apr. 16, 2019	Dec. 31, 2018	Nov. 16, 2018
Debt Instrument [Line Items]
Cash and equivalents	$ 147,441,000	$ 147,441,000	$ 617,294,000
Cash and cash equivalents	219,615,000	219,615,000	714,389,000	$ 423,221,000						$ 403,966,000
Loss on early extinguishment of debt		$ (115,288,000)
Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date		Jul. 30, 2026
Credit facility	2,500,000,000	$ 2,500,000,000
Covenant description		as of the last day of each fiscal quarter, the ratio of (a) Consolidated Total Funded Debt (as defined in the Credit Agreement) as of such date to (b) Consolidated EBITDA (as defined in the Credit Agreement), measured for the preceding 12 months, to not more than 3.75 to 1.00 (or 4.25 to 1.00 during material acquisition periods, subject to certain limitations).
Covenant compliance		As of December 31, 2021 and 2020, the Company was in compliance with all applicable covenants in the Credit Agreement as in effect as of the applicable date.
Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit	112,281,000	$ 112,281,000	119,636,000
Credit facility	320,000,000	320,000,000
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility	1,850,000,000	1,850,000,000
Long term debt	803,944,000	$ 803,944,000	$ 203,927,000
Commitment - rate applicable		0.09%	0.15%
Credit Agreement [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Credit facility	$ 650,000,000	$ 650,000,000
Credit Agreement [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate applicable	1.10%	1.10%
Commitment - rate applicable		0.065%
Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Required leverage ratio during material acquisition period		4.25
Required leverage ratio		3.75
Credit Agreement [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate applicable	3.25%	3.25%
Commitment - rate applicable		0.15%
Credit Agreement [Member] \| Maximum [Member] \| Swing Line Loans [Member]
Debt Instrument [Line Items]
Swing line loans	$ 100,000,000	$ 100,000,000
Other Facilities not Affiliated with Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit	13,527,000	13,527,000
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Long term debt	$ 37,508,000	$ 37,508,000	$ 43,131,000
Notes Payable to Sellers and Other Third Parties [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate	2.42%	2.42%
Senior note year due		2028
Notes Payable to Sellers and Other Third Parties [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate	10.35%	10.35%
Senior note year due		2036
Senior Notes [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount to be repurchased if change of control		100.00%
Covenant compliance		As of December 31, 2021 and 2020, the Company was in compliance with all applicable covenants in the Indenture
Senior Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount to be repurchased if change of control		101.00%
Senior Notes [Member] \| Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate			4.64%
Maturity date		Apr. 01, 2021
Long term debt	$ 100,000,000	$ 100,000,000	$ 100,000,000
Senior note year due		2021
Senior Notes [Member] \| New Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate			2.39%
Maturity date		Jun. 01, 2021
Long term debt			$ 150,000,000			$ 150,000,000
Senior note year due		2021
Senior Notes [Member] \| Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Interest rate			3.09%
Maturity date		Aug. 20, 2022
Long term debt	125,000,000	$ 125,000,000	$ 125,000,000
Senior note year due		2022
Senior Notes [Member] \| Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate			2.75%
Maturity date		Jun. 01, 2023
Long term debt	200,000,000	$ 200,000,000	$ 200,000,000
Senior note year due		2023
Senior Notes [Member] \| Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate			3.24%
Maturity date		Apr. 20, 2024
Long term debt			$ 150,000,000			150,000,000
Senior note year due		2024
Senior Notes [Member] \| Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate			3.41%
Maturity date		Aug. 20, 2025
Long term debt	$ 375,000,000	$ 375,000,000	$ 375,000,000
Senior note year due		2025
Senior Notes [Member] \| Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate			3.03%
Maturity date		Jun. 01, 2026
Long term debt			$ 400,000,000			400,000,000
Senior note year due		2026
Senior Notes [Member] \| Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate			3.49%
Maturity date		Apr. 20, 2027
Long term debt			$ 250,000,000			$ 250,000,000
Senior note year due		2027
Senior Notes [Member] \| Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Aggregate principal amount											$ 500,000,000
Interest rate	4.25%	4.25%	4.25%
Maturity date		Dec. 01, 2028
Redemption period end date		Sep. 01, 2028
Debt issuance costs	$ 5,792,000	$ 5,792,000
Percentage of aggregate principal amount to be repurchased if change of control		100.00%
Long term debt	$ 500,000,000	$ 500,000,000	$ 500,000,000
Senior note year due		2028
Senior Notes [Member] \| Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount									$ 500,000,000
Interest rate	3.50%	3.50%	3.50%
Maturity date		May 01, 2029
Redemption period end date		Feb. 01, 2029
Debt issuance costs	$ 5,954,000	$ 5,954,000
Long term debt	$ 500,000,000	$ 500,000,000	$ 500,000,000
Senior note year due		2029
Senior Notes [Member] \| Senior Notes due 2029 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount to be repurchased if change of control		100.00%
Senior Notes [Member] \| Senior Notes due 2030 [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 600,000,000
Interest rate	2.60%	2.60%	2.60%					2.60%
Maturity date		Feb. 01, 2030
Redemption period end date		Nov. 01, 2029
Debt issuance costs	$ 5,435,000	$ 5,435,000
Percentage of aggregate principal amount to be repurchased if change of control		100.00%
Long term debt	$ 600,000,000	$ 600,000,000	$ 600,000,000
Senior note year due		2030
Senior Notes [Member] \| Senior Notes due 2032 [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 650,000,000
Interest rate	2.20%	2.20%			2.20%
Maturity date		Jan. 15, 2032
Redemption period end date		Oct. 15, 2031
Debt discount	$ 1,066,000	$ 1,066,000
Debt issuance costs	$ 5,979,000	5,979,000
Percentage of aggregate principal amount to be repurchased if change of control	100.00%
Long term debt	$ 650,000,000	$ 650,000,000
Senior note year due		2032
Senior Notes [Member] \| Senior Notes due 2050 [Member]
Debt Instrument [Line Items]
Aggregate principal amount							$ 500,000,000
Interest rate	3.05%	3.05%	3.05%
Maturity date		Apr. 01, 2050
Redemption period end date		Oct. 01, 2049
Debt discount	$ 7,375,000	$ 7,375,000
Debt issuance costs	5,682,000	$ 5,682,000
Percentage of aggregate principal amount to be repurchased if change of control		100.00%
Long term debt	$ 500,000,000	$ 500,000,000	$ 500,000,000
Senior note year due		2050
Senior Notes [Member] \| Senior Notes due 2052 [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 850,000
Interest rate	2.95%	2.95%			2.95%
Maturity date		Jan. 15, 2052
Redemption period end date		Jul. 15, 2051
Debt discount	$ 12,742,000	$ 12,742,000
Debt issuance costs	$ 9,732,000	9,732,000
Percentage of aggregate principal amount to be repurchased if change of control	100.00%
Long term debt	$ 850,000,000	$ 850,000,000
Senior note year due		2052
Senior Notes [Member] \| Private Placement Notes [Member]
Debt Instrument [Line Items]
Redeemed aggregate principal amount of notes		$ 1,500,000,000
Senior Notes [Member] \| Private Placement Notes Make Whole Payment [Member]
Debt Instrument [Line Items]
Redeemed aggregate principal amount of notes		110,617,000
Term Loan Facility [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Long term debt	$ 650,000,000	$ 650,000,000	650,000,000
Interest rate applicable	1.10%	1.10%
Term Loan Facility [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum increase to borrowing capacity		$ 500,000,000
Maximum amount of increase in commitments under the credit agreement		3,000,000,000
Other Assets [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Prepaid expense, debt issuance costs	$ 3,711,000	3,711,000
Debt [Member]
Debt Instrument [Line Items]
Liabilities incurred		108,345,000	91,349,000	$ 95,809,000
Base Rate [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	$ 158,000,000	$ 158,000,000
Margin rate for loans		0.00%
Interest rate applicable	3.25%	3.25%
Base Rate [Member] \| Canadian Prime Rate Loans and Swing Line Loans [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Margin rate for loans		0.00%
Base Rate [Member] \| Canadian Prime Rate Loans and Swing Line Loans [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Margin rate for loans		0.25%
LIBOR [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	$ 631,000,000	$ 631,000,000	$ 200,000,000
Margin rate for loans		1.00%	1.20%
Interest rate applicable	1.10%	1.10%	1.35%
LIBOR [Member] \| Credit Agreement [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Long term debt	$ 650,000,000	$ 650,000,000	$ 650,000,000
Margin rate for loans		1.00%	1.20%
Interest rate applicable	1.10%	1.10%	1.35%
LIBOR [Member] \| Drawing Fees for Bankers Acceptance and BA Equivalent Notes and Letter of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Margin rate for loans		0.75%
LIBOR [Member] \| Drawing Fees for Bankers Acceptance and BA Equivalent Notes and Letter of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Margin rate for loans		1.25%
LIBOR [Member] \| Term Loan Facility [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	$ 1,281,000,000	$ 1,281,000,000
Canadian Bankers Acceptance Loan [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	$ 3,944,000	$ 3,944,000	$ 3,927,000
Margin rate for loans		1.00%	1.20%
Interest rate applicable	1.45%	1.45%	1.66%