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Short-term and long-term debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 10, 2017 | Jun. 01, 2017 | Jun. 01, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2016 | Jun. 22, 2012
Capital leased assets gross |  |  |  | $ 200,000 |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 130,000 | $ 130,000 |  |  |
Repayments Of Long Term Debt |  |  |  | 172,000 | $ 4,349,000 | $ 328,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 64,300,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 46,000,000
Minimum |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 40,000,000
Maximum |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 50,000,000 |
Vehicle and Equipment Loans | Minimum |  |  |  |  |  |  |  |
Credit facility effective rate of interest |  |  |  | 0.00% |  |  |  |
Vehicle and Equipment Loans | Maximum |  |  |  |  |  |  |  |
Credit facility effective rate of interest |  |  |  | 6.70% |  |  |  |
Term Loan |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 25,000,000 |  |  |  |  |  |  |
Interest rate description under PNC facility |  |  |  | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to domestic rate loans, the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus 0.5% and (3) the daily LIBOR plus 1.0%, plus (ii) between 0.50% and 1.00% depending on average quarterly undrawn availability and (B) with respect to Eurodollar rate loans, the sum of the Eurodollar rate plus between 1.50% and 2.00% depending on average quarterly undrawn availability. |  |  |  |
Debt Instrument, Maturity Date | Oct. 10, 2023 |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 105,000,000 |  |  |  |  |  |  |
Debt Instrument, Payment Terms | Principal payments on the Term Loans are required on a quarterly basis, commencing with the quarter ending March 31, 2018, in the amount of 1% of the original principal amount of the outstanding Term Loans per annum. The Term Loan Facility also requires annual payments of up to 50% of Excess Cash Flow (as defined in the Term Loan Facility) depending upon the Companys Total Leverage Ratio (as defined in the Term Loan Facility) for the applicable year. The Term Loan Facility also requires mandatory prepayments of the Term Loans in the event of certain asset dispositions, debt issuances, and casualty and condemnation events. The Term Loans may be prepaid at the option of the Borrowers at par in an amount up to $30 million. Additional prepayments are permitted after the first anniversary of the closing date subject to a prepayment premium of 3% in year two, 1% in year three and zero in year four and thereafter. |  |  |  |  |  |  |
Term Loan | Eurodollar |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 7.25% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |  |  |  |  |  |  |
PNC Bank [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000 |  |  | $ 80,000,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  | 65,000,000 |  |  |  |
PNC Bank [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 5,000,000 |  |  |  |  |  |  |
PNC Bank [Member] | Swing Line Loan [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 15,000,000 |  |  |  |  |  |  |
Busey Bank |  |  |  |  |  |  |  |
Principal balance of this mortgage note |  |  |  | $ 0 |  |  |  |
Busey Bank | Mortgage Note |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 855,000 |  |  |  |  |
Credit facility effective rate of interest |  |  | 4.00% |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  | Jun. 01, 2017 |  |  |  |  |
Repayments Of Long Term Debt |  | $ 15,815 |  |  |  |  |  |
Line of Credit Facility, Expiration Period |  |  | 60 months |  |  |  |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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