Revenue Recognition - Additional Information (Detail) $ in Millions |
Mar. 31, 2019
USD ($)
|
Dec. 31, 2018
Markets
|
|---|---|---|
| Revenue from Contract with Customer [Abstract] | ||
| Prepaid commission expense | $ | $ 0.7 | |
| Number of market locations | Markets | 35 |
| X | ||||||||||
- Definition Number of geographical market segments. No definition available.
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| X | ||||||||||
- Definition Amount of consideration paid in advance for commission expense. No definition available.
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| X | ||||||||||
- References No definition available.
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