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Notes Payable and Other Noncurrent Liabilities - Notes Payable (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Notes Payable through December 2019 [Member] |  |
Line of Credit Facility [Line Items] |  |
Monthly payment of notes payable | $ 556 |
Number of days of bank operating rate to calculate interest on notes payable | 30 days |
Interest rate of notes payable | 3.11% |
Notes Payable through December 2019 [Member] | LIBOR [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate of notes payable |  | 1.75%
Annuities Extending through 2019 [Member] |  |
Line of Credit Facility [Line Items] |  |
Quarterly payment of notes payable | $ 34 |
Interest rate of notes payable | 10.00% | 10.00%
Revolving Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Number of days of bank operating rate to calculate interest on notes payable | 30 days |
Interest rate of notes payable |  | 2.30%
Revolving Line of Credit [Member] | LIBOR [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate of notes payable | 1.75% |

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- Definition Period for bank operating rate to calculate interest on notes payable. + References No definition available. + Details
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- Definition Quarterly payment of notes payable. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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