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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 $ 10,000,000
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0  
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 $ 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