Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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DEBT - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
$1.2 billion senior credit facility weighted average rate 1.72%, due in 2019
Debt Instrument [Line Items]
Maximum borrowing capacity of line of credit facility	$ 1,200,000,000.0
Revolving credit facility, amount committed to outstanding letters of credit	157,700,000	162,900,000
Revolving credit facility, unused portion	866,700,000	577,100,000
$250 million term loan 0.92%, due in 2015
Debt Instrument [Line Items]
Long-term debt, face amount	250,000,000
$250 million term loan 0.92%, due in 2015 \| Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	250,000,000.0
$100 million private placement notes 5.64%, due in 2015
Debt Instrument [Line Items]
Long-term debt, face amount	100,000,000.0
$100 million private placement notes 5.64%, due in 2015 \| Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	100,000,000.0
$175 million private placement notes 3.89%, due in 2017
Debt Instrument [Line Items]
Long-term debt, face amount	175,000,000.0
$125 million private placement notes 2.68%, due in 2019
Debt Instrument [Line Items]
Long-term debt, face amount	125,000,000.0
$225 million private placement notes 4.47%, due in 2020
Debt Instrument [Line Items]
Long-term debt, face amount	225,000,000.0
$125 million private placement notes 3.26%, due in 2022
Debt Instrument [Line Items]
Long-term debt, face amount	$ 125,000,000.0