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Fair Value Measurement and Fair Value of Financial Instruments (Detail) - Senior Notes - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 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% |
4.7% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate (as a percent) | 4.70% |
Carrying Value | 4.375% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | $ 248,952 | $ 248,823
Carrying Value | 3.45% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 748,396 | 748,282
Carrying Value | Floating Rate Notes 2021 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 497,396 | 496,796
Carrying Value | 4.15% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 743,638 | 742,957
Carrying Value | 4.7% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 1,240,191 | 1,239,657
Fair Value | 4.375% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 259,010 | 254,218
Fair Value | 3.45% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 737,123 | 675,075
Fair Value | Floating Rate Notes 2021 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 496,830 | 497,425
Fair Value | 4.15% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | 792,390 | 729,350
Fair Value | 4.7% Senior Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt instrument | $ 1,349,025 | $ 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=118260190&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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