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Long-Term Debt (Narrative) (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2017	Apr. 20, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long term debt		$ 3,971,890,000		$ 3,632,692,000
Debt issuance costs		633,000
Cash and cash equivalents		268,469,000		154,382,000	$ 9,263,000	$ 10,974,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	[1]	$ 636,915,000		310,582,000
Credit Agreement [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate	[1]	2.02%
Credit Agreement [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate	[1]	4.25%
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Long term debt	[1]	$ 95,430,000		95,430,000
Tax-exempt Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	0.90%
Tax-exempt Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	0.96%
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Long term debt	[1]	$ 27,045,000		14,180,000
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	2.00%
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	24.81%
Senior Notes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 400,000,000
Senior Notes [Member] | Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long term debt		$ 50,000,000		$ 50,000,000
Interest rate		4.00%		4.00%
Senior Notes [Member] | Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Long term debt		$ 175,000,000		$ 175,000,000
Interest rate		5.25%		5.25%
Senior Notes [Member] | Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long term debt		$ 100,000,000		$ 100,000,000
Interest rate		4.64%		4.64%
Senior Notes [Member] | New Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long term debt		$ 150,000,000		$ 150,000,000
Interest rate		2.39%		2.39%
Senior Notes [Member] | Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Long term debt		$ 125,000,000		$ 125,000,000
Interest rate		3.09%		3.09%
Senior Notes [Member] | Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long term debt		$ 200,000,000		$ 200,000,000
Interest rate		2.75%		2.75%
Senior Notes [Member] | Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long term debt		$ 375,000,000		$ 375,000,000
Interest rate		3.41%		3.41%
Senior Notes [Member] | Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Long term debt		$ 400,000,000		$ 400,000,000
Interest rate		3.03%		3.03%
Term Loan Facility [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Long term debt	[1]	$ 1,637,500,000		$ 1,637,500,000
Interest rate	[1]	2.18%
Debt [Member]
Debt Instrument [Line Items]
Liabilities incurred		$ 56,957,000
Base Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 3,000,000
Interest rate applicable		4.25%
LIBOR [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 350,600,000
Interest rate applicable		2.02%
LIBOR [Member] | Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long term debt		$ 1,637,500,000		$ 1,637,500,000
Interest rate		2.18%		1.97%
Canadian Prime Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 11,345,000		$ 7,448,000
Interest rate applicable		2.95%		2.95%
Canadian Bankers Acceptance Loan [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 271,970,000		$ 303,134,000
Interest rate applicable		2.11%		2.13%
[1] Interest rates represent the interest rates incurred at March 31, 2017

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