External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
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1 Months Ended |
9 Months Ended |
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Jun. 30, 2016 |
Jun. 30, 2015 |
Sep. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
| Debt Instrument [Line Items] |
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| Revolving credit facility, extended expiration date |
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2021-06
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| Current portion of long-term debt |
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$ 0
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$ 0
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| Prepaid debt issuance cost, write off |
$ 1,300,000
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| Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital |
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25,700,000
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$ 0
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| Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding |
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$ 0
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800,000
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| Restatement Adjustment | Accounting Standards Update 2015-03 | Other Current Assets and Other Assets |
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| Debt Instrument [Line Items] |
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| Debt Issuance Costs, Line of Credit Arrangements |
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(3,000,000)
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| Restatement Adjustment | Accounting Standards Update 2015-03 | Long-term Debt |
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| Debt Instrument [Line Items] |
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| Debt Issuance Costs, Line of Credit Arrangements |
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3,000,000
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| LIBOR [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate over LIBOR |
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0.90%
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| LIBOR [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate over LIBOR |
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1.50%
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| Term Loan Facilities [Member] |
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| Debt Instrument [Line Items] |
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| Term loan, outstanding borrowings |
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$ 695,000,000
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279,000,000
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| Senior Unsecured Notes [Member] |
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| Debt Instrument [Line Items] |
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| Senior unsecured notes, price |
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$ 900,000,000
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| Senior notes, outstanding amount |
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$ 890,800,000
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$ 889,700,000
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| Senior Unsecured Notes [Member] | Notes Due 2020 [Member] |
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| Debt Instrument [Line Items] |
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| Senior unsecured notes, price |
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$ 400,000,000
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| Senior unsecured notes, maturity period |
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5 years
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| Senior unsecured notes, maturity year |
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2020
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| Senior unsecured notes, coupon rate |
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3.00%
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| Senior Unsecured Notes [Member] | Notes Due 2025 [Member] |
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| Debt Instrument [Line Items] |
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| Senior unsecured notes, price |
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$ 500,000,000
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| Senior unsecured notes, maturity period |
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10 years
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| Senior unsecured notes, maturity year |
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2025
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| Senior unsecured notes, coupon rate |
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4.00%
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| Amended and Restated Credit Agreement [Member] | Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
$ 1,250,000,000
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