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Reconciliation of Assets Measured at Fair Value on Recurring Basis using Unobservable Inputs Level 3 (Detail) (Auction Rate Securities, USD $)
In Thousands, unless otherwise specified |
6 Months Ended |
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Jun. 30, 2012
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Beginning Balance | $ 25,960 |
| Reclassified from other comprehensive income | 2,723 |
| Reported in earnings | (3,245) |
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Securities Redeemed at Less Than Par Value
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Cash received for redemptions | $ (25,438) |