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Commitments - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ | $ 946 | $ 947 | $ 1,012
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 | $ | $ 555 | $ 435 | $ 442
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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- 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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- 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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- Details
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Namespace Prefix: |
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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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Namespace Prefix: |
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- Details
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