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Investments in Debt and Equity Securities - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available for sale investments gross pre-tax unrealized gain (loss) $ 2,589 $ 5,181
Proceeds from sale of investments available-for-sale 1,295 1,262
Pre tax reclassification of net investment realized gain (loss) into net income 618 340
Reclassification of net investment realized gain (loss) into net income, net of tax 377 207
Certificates of deposit, commercial paper and money market funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Unrealized gain (loss) on investments, pre tax $ (1,974) $ 425