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Long-Term Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Payments on long -term debt due in 2022 | $ 78,425,000 |  |  |
Available borrowings capacity under credit agreement |  | $ 104,853,000 |  |
Secured Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Average line of credit facility outstanding | $ 51,103,000 | $ 59,897,000 |  |
Weighted average interest rate | 3.00% | 2.30% |  | 2.10%
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowings capacity under credit agreement |  |  | $ 250,000,000 |
Capacity to increase borrowings under credit agreement | $ 139,241,000 |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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