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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfer of assets from level 1 to 2   $ 0
Transfer of assets from level 2 to 1 $ 10,000,000 0
Transfer of liabilities from level 1 to 2   0
Transfer of liabilities from level 2 to 1 0 0
Transfer of assets into level 3 0 0
Transfer of assets out of level 3 0 0
Transfer of liabilities into level 3 0 0
Transfer of liabilities out of level 3 0 0
Realized gain (loss) on financial assets   $ 0
Other Income (Expense) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recognized other-than-temporary impairment loss $ 10,000