XML 74 R58.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitment and Contingencies (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Commitments and Contingencies |  |  |  |
Amount of application under DOE Loan Guarantee Program | $ 2,000,000,000 |  |  |
Potential financing from Japanese export credit agencies under discussion | 1,000,000,000 |  |  |
Minimum additional financing needed for ACP beyond DOE and Japanese | 1,000,000,000 |  |  |
Contingent commercial ACP license royalty limit | 665,000,000 |  |  |
NYSE 30-day average minimum market capitalization | 50,000,000 |  |  |
Stockholders' Equity (Deficit) | (469,600,000) | (472,900,000) | 728,900,000 | 752,400,000
PBGC estimate of potential Portsmouth pension liability | $ 130,000,000 |  |  |

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of application under DOE Loan Guarantee Program + References No definition available. + Details
Name: | usu_AmountOfApplicationUnderDoeLoanGuaranteeProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contingent commercial ACP license royalty limit + References No definition available. + Details
Name: | usu_ContingentCommercialAcpLicenseRoyaltyLimit
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum additional financing needed for ACP beyond DOE and Japanese + References No definition available. + Details
Name: | usu_MinimumAdditionalFinancingNeededForAcpBeyondDoeAndJapanese
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition NYSE 30-day average minimum market capitalization + References No definition available. + Details
Name: | usu_Nyse30DayAverageMinimumMarketCapitalization
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition PBGC estimate of potential Portsmouth pension liability + References No definition available. + Details
Name: | usu_PbgcEstimateOfPotentialPortsmouthPensionLiability
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Potential financing from Japanese export credit agencies under discussion + References No definition available. + Details
Name: | usu_PotentialFinancingFromExportCreditAgenciesUnderDiscussion
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant