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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

X

- 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

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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

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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.

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