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Long-Term Debt - Narrative (Detail) |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2014 USD ($) | May 20, 2014 USD ($) extension | Oct. 12, 2012 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Jan. 15, 2015 USD ($) | Apr. 17, 2014 USD ($) | Apr. 16, 2014 USD ($) | Apr. 15, 2014 USD ($) | Jul. 01, 2013 USD ($) | Sep. 15, 2011 USD ($) | Feb. 01, 2008 USD ($) | Dec. 22, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | $ 495,000,000 |  | $ 529,375,000 |  |  | $ 25,000,000.0 |  |  |  |  |
Revolving and term loan |  |  |  | 50,000,000.0 |  |  |  |  |  |  |  |  |  |
Potential increased in line of credit facility |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  | 800,000,000.0 |  |  |  |  |  |
Unsecured term loans |  |  |  |  |  |  |  | 550,000,000.0 |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | 0 | $ 475,000,000 |  |  |  |  |  |  |  |  |
Outstanding debt balance |  |  |  | $ 1,159,839,000 |  | $ 1,198,471,000 |  |  |  |  |  |  |  |
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 5.37% |  | 5.37% |  |  |  |  |  |  |  |
Current portion of senior notes |  |  |  | $ 0 |  | $ 25,000,000 | $ 25,000,000 |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  | 2015 |  | 2015 |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | $ 536,300,000 |  | $ 550,000,000 |  |  |  |  |  |  |  |
Number of extension periods | extension |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  | $ 1,350,000,000.0 |  |  |  |  |  |
First principal payment |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt balance |  |  |  | $ 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |  |
Wells Fargo Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |
Potential increased in line of credit facility |  |  |  | $ 75,000,000.0 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 0 |  | 0 |  |  |  |  |  |  |  |
Wells Fargo Revolver | Beecher Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000.0 |  |  |
Line of Credit | Wells Fargo Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit usage fee, minimum |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Letter of credit usage fee, maximum |  |  |  | 1.40% |  |  |  |  |  |  |  |  |  |
LIBOR below base rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Availability fees, minimum |  |  |  | 0.175% |  |  |  |  |  |  |  |  |  |
Availability fees, maximum |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 550,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount | $ 475,000,000 | $ 375,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | $ 0 |  | 0 |  |  |  |  |  |  |  |
Uncommitted Facility | New Master Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |
Potential increased in line of credit facility |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |
Issuance period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Maturity period |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Master Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |
Master Agreement | Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 | $ 25,000,000.0
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.66%
Master Agreement | Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.37% |
Master Agreement | Series E |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |
LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |
Minimum | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Minimum | LIBOR | Line of Credit | Wells Fargo Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Minimum | LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 0.85% |  |  |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility fee |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Maximum | LIBOR | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
Maximum | LIBOR | Line of Credit | Wells Fargo Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.40% |  |  |  |  |  |  |  |  |  |
Maximum | LIBOR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 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 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term notes having the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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