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Commitments and Contingencies Additional Information (Detail) (USD $)
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Dec. 31, 2012
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Sep. 30, 2012
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| Loss Contingencies [Line Items] | ||
| Amount of settlement payment | $ 7,800,000 | $ (7,750,000) |
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Sales Tax Audit [Member]
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| Loss Contingencies [Line Items] | ||
| Contingent liability/reserve | 0 | |
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Other Legal Matters [Member]
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| Loss Contingencies [Line Items] | ||
| Contingent liability/reserve | $ 0 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of consideration the entity has agreed to pay to settle a legal matter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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