XML 48 R27.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Subsidiary Guarantors - Senior Notes (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Senior Notes [Line Items] |  |
Carrying value of senior notes | $ 550,000,000 | $ 550,000,000
Event of default for senior notes - failure of other debt payment at maturity in excess of this amount | 50,000,000 |
Our ownership percentage of subsidiary guarantors of senior notes | 100.00% |
Event of default for senior notes - not discharged, bonded or insured judgment in excess of this amount | 50,000,000 |
Senior Notes Due 2020 [Member] |  |
Senior Notes [Line Items] |  |
Interest rate of senior notes | 6.625% |
Portion of proceeds from senior notes used to repay outstanding term debt | 200,000,000 |
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control | 101.00% |
Senior Notes Due 2020 [Member] | Senior Notes, Redemption, Period One [Member] |  |
Senior Notes [Line Items] |  |
Senior notes, redemption price, percentage | 103.313% |
Senior Notes Due 2020 [Member] | Senior Notes, Redemption, Period Four [Member] |  |
Senior Notes [Line Items] |  |
Senior notes, redemption price, percentage | 100.00% |
Senior Notes Due 2021 [Member] |  |
Senior Notes [Line Items] |  |
Interest rate of senior notes | 4.75% |
Portion of proceeds from senior notes used to repurchase shares of common stock | $ 200,000,000 |
Percentage of original aggregate principle amount of senior notes included in repurchase price at change of control | 101.00% |
Senior Notes Due 2021 [Member] | Senior Notes, Redemption, Period One [Member] |  |
Senior Notes [Line Items] |  |
Senior notes, redemption price, percentage | 103.563% |
Senior Notes Due 2021 [Member] | Senior Notes, Redemption, Period Four [Member] |  |
Senior Notes [Line Items] |  |
Senior notes, redemption price, percentage | 100.00% |

X
- Definition Event of default - Failure of other debt payment in excess. + References No definition available. + Details
Name: | na_EventOfDefaultFailureOfOtherDebtPaymentInExcess
Namespace Prefix: | na_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Event of default - Not discharged judgment in excess. + References No definition available. + Details
Name: | na_EventOfDefaultNotDischargedJudgmentInExcess
Namespace Prefix: | na_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Our ownership percentage of subsidiary guarantor. + References No definition available. + Details
Name: | na_OurOwnershipPercentageOfSubsidiaryGuarantor
Namespace Prefix: | na_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of original aggregate principle. + References No definition available. + Details
Name: | na_PercentageOfOriginalAggregatePrinciple
Namespace Prefix: | na_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds to repay term debt. + References No definition available. + Details
Name: | na_ProceedsToRepayTermDebt
Namespace Prefix: | na_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proceeds to repurchase shares of common stock + References No definition available. + Details
Name: | na_Proceedstorepurchasesharesofcommonstock
Namespace Prefix: | na_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | na_SeniorNotesLineItems
Namespace Prefix: | na_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + 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(a)) -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 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant