Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Commitments and Contingencies Disclosure [Abstract] | |||
| Current portion of capital leases and other debt | $ 1.1 | $ 1.0 | |
| Long-term capital leases and other debt | $ 3.7 | 3.6 | |
| Lease extension period | 2034 | ||
| Operating leases, rental expense | $ 21.9 | $ 22.1 | $ 17.4 |