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Fair Value Measurement and Fair Value of Financial Instruments (Detail) - Senior Notes - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 14, 2018
--- | --- | --- | ---
4.375% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate (as a percent) | 4.375% |  |
3.45% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate (as a percent) | 3.45% |  |
4.15% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate (as a percent) | 4.15% |  | 4.15%
4.7% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Stated interest rate (as a percent) | 4.70% |  | 4.70%
Carrying Value | 4.375% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | $ 248,888 | $ 248,823 |
Carrying Value | 3.45% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 748,339 | 748,282 |
Carrying Value | Floating Rate Notes 2021 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 497,096 | 496,796 |
Carrying Value | 4.15% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 743,298 | 742,957 |
Carrying Value | 4.7% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 1,239,924 | 1,239,657 |
Fair Value | 4.375% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 250,108 | 254,218 |
Fair Value | 3.45% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 698,258 | 675,075 |
Fair Value | Floating Rate Notes 2021 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 500,495 | 497,425 |
Fair Value | 4.15% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | 762,870 | 729,350 |
Fair Value | 4.7% Senior Notes |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Debt instrument | $ 1,267,750 | $ 1,179,625 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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