Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Property, Plant and Equipment [Abstract] | ||
| Fully depreciated computer software and hardware and furniture, fixtures and equipment write-off | $ 0.8 | $ 1.1 |
| X | ||||||||||
- Definition Fully depreciated computer software hardware and furniture fixtures and equipment writeoff. No definition available.
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| X | ||||||||||
- References No definition available.
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