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Fair Value - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers into or out of Level 3 of fair value of assets $ 0 $ 0
Transfers into or out of Level 3 of fair value of liabilities $ 0 $ 0