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Summary of Significant Accounting Policies (Schedule of Intangible Assets Measured At Fair Value On Non-recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended |
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Sep. 30, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Total Gains (Losses) | $ (3,349) |
| Long-lived assets held and used | 2,500 |
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Long-lived assets held and used | |
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Significant Other Observable Inputs (Level 2) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Long-lived assets held and used | |
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Significant Unobservable Inputs (Level 3) [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Long-lived assets held and used | $ 2,500 |