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Fair Value Measurements - Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Fair Value Disclosures [Abstract]  
Balance at the beginning of the period $ 2,526
Credit gain on available-for-sale securities included in Other income (expense), net 10
Gain included in Other comprehensive income (loss) 44
Balance at the end of the period $ 2,580