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Commitments - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ | $ 1,102 | $ 946 | $ 947
Hannibal, Missouri |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Marsing |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 25 years |  |
Number of acres owns | a | 15 |  |
Number of acres holds on long-term ground lease | a | 2 |  |
Vehicle Lease |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ | $ 529 | $ 555 | $ 435
Minimum | Axis, Alabama |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Maximum | Axis, Alabama |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 35 years |  |

X
- Definition Lease Expiration Period + References No definition available. + Details
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Balance Type: | na
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- Definition Schedule Of Commitments And Contingencies [Line Items] + References No definition available. + Details
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- Definition Area of land held. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Definition Area of land subject to a ground lease. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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