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Financing Agreements - Margin Based on Remaining Borrowing Availability (Detail) | 9 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2014 LIBOR Rate [Member] Greater than $350 [Member] Revolving Facility [Member] | Sep. 30, 2014 LIBOR Rate [Member] Greater than $150 but less than or equal to $350 [Member] Revolving Facility [Member] | Sep. 30, 2014 LIBOR Rate [Member] $150 or less [Member] Revolving Facility [Member] | Sep. 30, 2014 Base Rate [Member] Greater than $350 [Member] Revolving Facility [Member] | Sep. 30, 2014 Base Rate [Member] Greater than $150 but less than or equal to $350 [Member] Revolving Facility [Member] | Sep. 30, 2014 Base Rate [Member] $150 or less [Member] Revolving Facility [Member] | Sep. 30, 2014 Senior Notes Due February 2019 [Member] | Dec. 31, 2013 Senior Notes Due February 2019 [Member] | Sep. 30, 2014 Senior Notes Due February 2021 [Member] | Dec. 31, 2013 Senior Notes Due February 2021 [Member] | Sep. 30, 2014 Senior Notes Due September 2021 [Member] | Dec. 31, 2013 Senior Notes Due September 2021 [Member] | Sep. 30, 2014 Senior Notes Due September 2023 [Member] | Dec. 31, 2013 Senior Notes Due September 2023 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 6.50% | 6.50% | 6.75% | 6.75% | 5.375% | 5.375% | 6.00% | 6.00%
Margin rate | 1.50% | 1.75% | 2.00% | 0.50% | 0.75% | 1.00% |  |  |  |  |  |  |  |

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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 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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