Financial Instruments - Long-Term Debt - Footnotes (Detail)	12 Months Ended
Dec. 31, 2015
Senior Unsecured Debt, 2.10%, Due 2019 [Member]
Debt Instrument [Line Items]
Debt redemption price, basis spread percentage	0.07%
Senior Unsecured Debt, 5.95%, Due 2037 [Member]
Debt Instrument [Line Items]
Debt redemption price, basis spread percentage	0.25%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt redemption price, percentage	100.00%
Unsecured Debt [Member] \| Senior Unsecured Debt, 2.10%, Due 2019 [Member]
Debt Instrument [Line Items]
Interest rate, percentage	2.10%
Unsecured Debt [Member] \| Senior Unsecured Debt, 5.95%, Due 2037 [Member]
Debt Instrument [Line Items]
Interest rate, percentage	5.95%
Unsecured Debt [Member] \| Notes Payable And Other Debt, Weighted Average Interest Rate 5.18% Percent, Various Maturity Dates [Member]
Debt Instrument [Line Items]
Interest rate, percentage	5.18%
Long term debt weighted average maturity	15 years
Debt redemption price, basis spread percentage	0.20%
Unsecured Debt [Member] \| Notes Payable And Other Debt, Weighted Average Interest Rate 2.83%, Due 2017-2020 [Member]
Debt Instrument [Line Items]
Interest rate, percentage	2.83%
Long term debt weighted average maturity	2 years
Debt redemption price, basis spread percentage	0.12%
Unsecured Debt [Member] \| US Treasury Rate [Member]
Debt Instrument [Line Items]
Debt redemption price, basis spread percentage	0.50%
Unsecured Debt [Member] \| Government Bond Rate [Member]
Debt Instrument [Line Items]
Debt redemption price, basis spread percentage	0.20%

Debt Instrument, Redemption Rule, Redemption Price, Percentage

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- Definition

Debt Instrument, Redemption Rule, Redemption Price, Percentage, Basis Spread

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Weighted Average Maturity

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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(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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- Details

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- Details

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- Details

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- Details

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