Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2016 |
Dec. 31, 2015 |
|
| Commitments And Contingencies Disclosure [Abstract] | |||
| Outstanding borrowings | $ 275.0 | $ 275.0 | $ 273.0 |
| Legal settlement with service provider | $ 1.1 | 1.1 | |
| Contractual settlement | $ 1.4 |