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Fair Value Measurements - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Fair Value Measurements [Line Items]    
Fair value measurement, realized gains or losses $ 0 $ 0
Level 3 [Member]
   
Schedule Of Fair Value Measurements [Line Items]    
Fair value measurement, unrealized losses $ 0 $ 0