Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] | |||
| Transfers between fair value measurement levels | $ 0 | $ 0 | $ 0 |
| Estimated dividend yield | 0.00% | ||