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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]    
Gains or losses recognized as result of transfer of securities $ 0  
Assets, Level 1 to Level 2 transfer   $ 0
Assets, Level 2 to Level 1 transfer   0
Liabilities, Level 1 to Level 2 transfer   0
Liabilities, Level 2 to Level 1 transfer   0
Assets, transfers into Level 3   0
Assets, transfers out of Level 3   0
Liabilities, transfers into Level 3   0
Liabilities, transfers out of Level 3   $ 0