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Long-Term Debt (Narrative) (Detail) - USD ($) |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2018 | Sep. 30, 2018 | Aug. 01, 2018 | Jul. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Apr. 20, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 3,763,330,000 |  |  |  | $ 3,926,321,000 |
Cash and cash equivalents |  |  | 244,389,000 |  |  |  | 433,815,000 |
Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  | $ 3,200,000,000 |  |  |  |  |
Covenant decription |  |  | During the continuance of an event of default, the Lenders may take a number of actions, including, among others, declaring the entire amount then outstanding under the Credit Agreement to be due and payable. The Credit Agreement includes a financial covenant limiting, as of the last day of each fiscal quarter, the ratio of (a) (i) Consolidated Total Funded Debt (as defined in the Credit Agreement) as of such date less (ii) the sum of cash and cash equivalents of the Company and its subsidiaries on a dollar-for-dollar basis as of such date in excess of $50,000 up to a maximum of $200,000 (such that the maximum amount of reduction pursuant to this calculation does not exceed $150,000) to (b) Consolidated EBITDA (as defined in the Credit Agreement), measured for the preceding 12 months (the "Leverage Ratio"), to not more than 3.50 to 1.00 (or 3.75 to 1.00 during material acquisition periods, subject to certain limitations). The Credit Agreement also includes a financial covenant requiring the ratio of Consolidated EBIT (as defined in the Credit Agreement) to Consolidated Total Interest Expense (as defined in the Credit Agreement), in each case, measured for the preceding 12 months, to be not less than 2.75 to 1.00. |  |  |  |  |
Maturity date |  |  | Mar. 21, 2023 |  |  |  |  |
Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  | $ 500,000,000 |  |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  | 1,562,500,000 |  |  |  |  |
Long term debt | [1] |  | $ 169,950,000 |  |  |  | 192,101,000 |
Interest rate | [1] |  | 2.93% |  |  |  |  |
Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  | $ 1,637,500,000 |  |  |  |  |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Required interest coverage ratio |  |  | 2.75 |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Reguired leverage ratio during material acquisition period |  |  | 3.75 |  |  |  |  |
Required leverage ratio |  |  | 3.50 |  |  |  |  |
Credit Agreement [Member] | Maximum [Member] | Swing Line Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Swing line loans |  |  | $ 75,000,000 |  |  |  |  |
2016 Master Note Purchase Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum limit of aggregate principal amount of notes outstanding |  |  | 1,500,000,000 |  |  |  |  |
Tax-exempt Bonds [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt | [1] |  | $ 15,930,000 |  |  |  | 95,430,000 |
Interest rate | [1] |  | 1.61% |  |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt | [1] |  | $ 14,950,000 |  |  |  | 26,290,000 |
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | [1] |  | 2.75% |  |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | [1] |  | 24.81% |  |  |  |  |
Pennsylvania Economic Development Corporation IRB Bond [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 35,000,000 |  |
Mission Economic Development Corporation IRB Bond [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 24,000,000 |  |
Seneca County Industrial Development Agency IRB Bond [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal balance |  |  |  |  | $ 5,000,000 |  |  |
West Valley Tax-Exempt Bond [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal balance |  |  |  | $ 15,500,000 |  |  |  |
Senior Notes [Member] | 2016 Master Note Purchase Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 1,150,000,000 |  |  |  |  |
Senior Notes [Member] | Assumed 2008 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum limit of aggregate principal amount of notes outstanding |  |  | 1,250,000,000 |  |  |  |  |
Aggregate principal amount |  |  | $ 775,000,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2018 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  | 50,000,000 |
Maturity date |  |  | Apr. 02, 2018 |  |  |  |  |
Interest rate |  | 4.00% |  |  |  |  |  |
Maturities of senior notes |  | $ 50,000,000 |  |  |  |  |  |
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% |  |  |  |  |
Aggregate principal amount |  |  | $ 175,000,000 |  |  |  |  |
Debt instrument maturity date year |  |  | 2019 |  |  |  |  |
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% |  |  |  |  |
Aggregate principal amount |  |  | $ 100,000,000 |  |  |  |  |
Debt instrument maturity date year |  |  | 2021 |  |  |  |  |
Senior Notes [Member] | New Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 150,000,000 |  |  |  | 150,000,000 |
Maturity date |  |  | Jun. 01, 2021 |  |  |  |  |
Interest rate |  |  | 2.39% |  |  |  |  |
Aggregate principal amount |  |  | $ 150,000,000 |  |  |  |  |
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% |  |  |  |  |
Aggregate principal amount |  |  | $ 125,000,000 |  |  |  |  |
Debt instrument maturity date year |  |  | 2022 |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 200,000,000 |  |  |  | 200,000,000 |
Maturity date |  |  | Jun. 01, 2023 |  |  |  |  |
Interest rate |  |  | 2.75% |  |  |  |  |
Aggregate principal amount |  |  | $ 200,000,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2024 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 150,000,000 |  |  |  | 150,000,000 |
Maturity date |  |  | Apr. 20, 2024 |  |  |  |  |
Interest rate |  |  | 3.24% |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 150,000,000
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% |  |  |  |  |
Aggregate principal amount |  |  | $ 375,000,000 |  |  |  |  |
Debt instrument maturity date year |  |  | 2025 |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2026 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 400,000,000 |  |  |  | 400,000,000 |
Maturity date |  |  | Jun. 01, 2026 |  |  |  |  |
Interest rate |  |  | 3.03% |  |  |  |  |
Aggregate principal amount |  |  | $ 400,000,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2027 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt |  |  | $ 250,000,000 |  |  |  | 250,000,000 |
Maturity date |  |  | Apr. 20, 2027 |  |  |  |  |
Interest rate |  |  | 3.49% |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | 250,000,000
Senior Notes [Member] | 2017 A Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000
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] |  | 3.34% |  |  |  |  |
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 |  |  | 3,700,000,000 |  |  |  |  |
Credit Agreement Covenant [Member] | Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 50,000,000 |  |  |  |  |
Credit Agreement Covenant [Member] | Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 200,000,000 |  |  |  |  |
Credit Agreement Covenant [Member] | Other Assets [Member] | Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 150,000,000 |  |  |  |  |
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 |  |  | 0.50% |  |  |  |  |
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 |  |  | 3.34% |  |  |  | 2.77% |
LIBOR [Member] | Drawing Fees for Bankers' Acceptance and BA Loans and Letter of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin rate for loans |  |  | 1.00% |  |  |  |  |
LIBOR [Member] | Drawing Fees for Bankers' Acceptance and BA Loans and Letter of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin rate for loans |  |  | 1.50% |  |  |  |  |
Canadian Prime Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility outstanding |  |  |  |  |  |  | $ 16,739,000 |
Interest rate applicable |  |  |  |  |  |  | 3.45% |
Canadian Bankers Acceptance Loan [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility outstanding |  |  | $ 169,950,000 |  |  |  | $ 175,362,000 |
Interest rate applicable |  |  | 2.93% |  |  |  | 2.64% |
[1] | Interest rates represent the interest rates incurred at September 30, 2018

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