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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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   $ 10,000,000   0
Transfer of liabilities from level 1 to 2         0
Transfer of liabilities from level 2 to 1         0
Transfer of assets into level 3         0
Transfer of assets out of level 3         0
Transfer of liabilities into level 3         0
Transfer of liabilities 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 $ 0 $ 0 $ 10,000 $ 0