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Long-Term Debt (Detail) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Aug. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 2,150,000,000 | $ 2,150,000,000 | $ 2,450,000,000 |
Debt issuance costs | (13,596,000) | (15,729,000) | (16,511,000) |
Long-term debt | 2,136,404,000 | 2,134,271,000 | 2,433,489,000 |
Less: current portion, net | (250,000,000) | 0 | (300,000,000) |
Total long-term debt | 1,886,404,000 | 2,134,271,000 | 2,133,489,000 |
2010 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 500,000,000 | 500,000,000 | 500,000,000 |
2011 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 300,000,000 | 300,000,000 | 600,000,000 |
2013 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 500,000,000 | 500,000,000 | 500,000,000 |
2014 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 500,000,000 | 500,000,000 | 500,000,000 |
2016 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 350,000,000 | $ 350,000,000 | $ 350,000,000 |
Debt instrument, face amount |  |  |  | $ 350,000,000.0
Debt instrument, stated interest rate |  |  |  | 2.35%
Prior to Par Call Date | 2016 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Interest rate margin for loans | 20.00% |  |  |
Subsequent to Par Call Date | 2016 Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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