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FINANCING ARRANGEMENTS Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Feb. 28, 2015 | Aug. 23, 2013 USD ($) | Oct. 29, 2012 USD ($)
Level 2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt fair value | $ 522,200,000 | $ 500,000,000 |  |  |
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 900,000,000 |  |  | $ 500,000,000
Additional borrowing capacity credit facility |  |  |  |  | $ 500,000,000
Debt instrument, interest rate during period | 1.30% | 1.70% |  |  |
Debt, weighted average interest rate | 1.60% | 1.30% |  |  |
Debt instrument, covenant, leverage ratio, minimum | 0.65 |  |  |  |
Debt instrument, covenant, leverage ratio, maximum | 1.00 |  |  |  |
Debt instrument, covenant, leverage debt to EBITDA ratio, maximum |  |  | 3.00 |  |
Debt instrument, covenant, leverage debt to EBITDA ratio, minimum |  |  | 1.00 |  |
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | Federal Funds Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | LIBOR Rate Option |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, description of variable rate basis | One-month LIBOR |  |  |  |
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.125% |  |  |  |
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | Current Liability |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing outstanding | $ 450,000,000 | $ 605,000,000 |  |  |
Senior Notes | Series A Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 175,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  | 3.97% |
Senior Notes | Series B Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 150,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  | 4.26% |
Senior Notes | Series C Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 175,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  | 4.60% |
Senior Notes | Note Purchase Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, covenant, leverage ratio, minimum | 0.65 |  |  |  |
Debt instrument, covenant, leverage ratio, maximum | 1.00 |  |  |  |
Debt instrument, covenant, leverage debt to EBITDA ratio, maximum |  |  | 3.00 |  |
Debt instrument, covenant, leverage debt to EBITDA ratio, minimum |  |  | 1.00 |  |
Debt instrument, interest expense ratio, maximum | 2.00 |  |  |  |
Debt instrument, interest expense ratio, minimum | 1.00 |  |  |  |
Debt instrument, priority debt, percentage | 15.00% |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |  |

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- Definition Debt Instrument, Covenant, Interest Expense Ratio, Maximum + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + 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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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