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Financial Instruments - Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level3) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]  
Balance $ 7,382
Unrealized gain (loss)   
Balance $ 7,382