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Long-Term Debt and Short-Term Borrowings - Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2017 | Mar. 14, 2013 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from revolving credit facility |  |  | $ 2,913,000,000 | $ 911,000,000 |
Write-off of financing costs on extinguished debt |  |  | $ 27,982,000 |  |
Senior notes |  |  |  |  | $ 791,700,000
Minimum coverage ratio of EBITDA to total interest expense expressed in percentage |  |  | 2.00% |  |
Maximum leverage ratio of total debt less available cash to EBITDA expressed in percentage |  |  | 4.25% |  |
Maximum leverage ratio during first four quarter that qualified acquisition is consummated |  |  | 4.75% |  |
Coverage ratio of EBITDA to total interest expense expressed in percentage |  |  | 18.62% |  |
Leverage ratio of total debt less available cash to EBITDA expressed in percentage |  |  | 0.79% |  |
2017 Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amounts available to borrow under Credit Agreement |  |  | $ 2,800,000,000 |  |
Revolving credit facility maturity date |  |  | Oct. 31, 2022 |  |
5.00% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount issued |  | $ 800,000,000 |  |  |
Interest rate of long-term debt |  |  | 5.00% |  | 5.00%
Redemption details |  |  | In March 2018, we redeemed our 5.00% senior notes in full |  |
Redemption date |  |  | Mar. 15, 2018 |  | Mar. 15, 2018
Senior notes |  |  |  |  | $ 791,700,000
5.00% Senior Notes [Member] | Redemption on March 15, 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption charges |  | 28,000,000 |  |  |
Senior notes, redemption premium |  | 20,000,000 |  |  |
Write-off of financing costs on extinguished debt |  | $ 8,000,000 |  |  |
5.00% senior notes due March 15, 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  |  | Mar. 15, 2023 |  |
Interest rate of long-term debt |  | 5.00% |  |  |
Accrued interest percentage per year |  | 5.00% |  |  |
Debt Instrument, Frequency of Periodic Payment |  |  | semi-annually |  |
Redemption details |  |  | The 5.00% senior notes were redeemable at our option, in whole or in part, on March 15, 2018 at a redemption price of 102.5% of the principal amount on that date. We redeemed these notes in full on March 15, 2018 and incurred charges of $28.0 million, including a premium of $20.0 million and the write-off of $8.0 million of unamortized deferred financing costs. We funded this redemption with $550.0 million of borrowings from our tranche A term loan facility and borrowings from our revolving credit facility under our 2017 Credit Agreement. |  |
5.00% senior notes due March 15, 2023 [Member] | Redemption on March 15, 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage |  | 102.50% |  |  |
4.875% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate of long-term debt |  |  | 4.875% |  | 4.875%
Senior notes |  |  | $ 592,600,000 |  | $ 592,000,000
5.25% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate of long-term debt |  |  | 5.25% |  | 5.25%
Senior notes |  |  | $ 422,600,000 |  | $ 422,400,000
Revolving credit facility [Member] | 2017 Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from revolving credit facility | $ 83,000,000 |  |  |  |
Tranche A term loan facility [Member] | 2017 Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from revolving credit facility | $ 200,000,000 |  |  |  |
Amounts available to borrow under Credit Agreement |  |  | $ 750,000,000 |  |
Maximum leverage ratio |  |  | 250.00% |  |
Revolving credit facility maturity date |  |  | Oct. 31, 2022 |  |
Tranche A term loan facility [Member] | 5.00% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount issued |  | $ 550,000,000 |  |  |

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- Definition Ratio of EBITDA as defined in the Credit Agreement to interest expense calculated over a trailing twelve month period. + References No definition available. + Details
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- Definition This element represents the minimum ratio of earnings before interest, taxes, depreciation and amortization (EBITDA) to total interest expense required in the reporting entity's credit agreement. + References No definition available. + Details
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