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Debt - Summary of Outstanding Debt (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Senior Unsecured Notes Series D [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument		3.22%
Senior Unsecured Notes Series B [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	5.00%	5.00%
Senior Unsecured Notes Series E [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.97%	3.97%
Senior Unsecured Notes Series F [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.40%	3.40%
Senior Unsecured Notes Series G [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.92%	3.92%
Senior Unsecured Notes Series H [Member]
Debt Instrument [Line Items]
Interest rate terms on debt	Series H senior unsecured notes bear interest at a 3-month LIBOR for that floating rate interest period plus 1.25%.
Senior Unsecured Notes Series I [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.13%	3.13%
Senior Unsecured Notes Series J [Member]
Debt Instrument [Line Items]
Interest rate terms on debt	Series J senior unsecured notes bore interest at a 3-month LIBOR for that floating rate interest period plus 1.45%.
Senior Unsecured Notes Series K [Member]
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.44%	3.44%

X

- 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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X

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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-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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