Debt - Long-Term Debt and Short-Term Borrowings (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Interest rate, stated rate	5.76%
Interest rate, weighted average	0.451%us-gaap_DebtWeightedAverageInterestRate
Senior Notes, interest at 7.375%, maturing 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	7.375%	7.375%
Senior Notes, interest at 6.75%, maturing 2018 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	6.75%	6.75%
Senior Notes, interest at 7.15%, maturing 2019 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	7.15%	7.15%
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	3.125%	3.125%
Senior Notes, interest at 3.75%, maturing 2025 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	3.75%	3.75%
Senior Notes, interest at 4.5%, maturing 2034 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	4.50%	4.50%
Mortgages and other, interest rates ranging from non-interest bearing to 3.65%, various maturities [Member]
Debt Instrument [Line Items]
Minimum Interest Rate, Stated Percentage on Revolving Credit Facilities	0.00%	0.00%
Maximum Interest Rate, Stated Percentage on Revolving Credit Facilities	3.65%	3.65%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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