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Debt - Narrative (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 22, 2016
Line of Credit Facility [Line Items] |  |  |
Long-term outstanding borrowings | $ 19,114,000 | $ 24,516,000 |
Capital Leases |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, weighted average interest rates | 4.85% |  |
Term Loan |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, maximum borrowing capacity |  |  | $ 75,000,000
Line of credit facility incremental borrowing capacity |  |  | 50,000,000
Current outstanding borrowings | $ 4,200,000 | 3,800,000 |
Long-term outstanding borrowings | 65,200,000 | 66,600,000 |
Unamortized transaction costs | $ 900,000 | 900,000 |
Debt instrument, percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights | 100.00% |  |
Debt instrument, percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment | 100.00% |  |
Debt instrument, percentage of excess cash flow to be used for mandatory prepayment starting next fiscal year | 50.00% |  |
Debt instrument, step-down percentage | 0.00% |  |
Debt instrument covenant leverage ratio | 275.00% |  |
Debt instrument, percentage of net cash proceeds from issuances of permitted equity securities to be used for mandatory prepayment | 100.00% |  |
Term Loan | Federal Funds Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 0.50% |  |
Term Loan | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 1.00% |  |
Term Loan | LIBOR | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument applicable margin | 2.25% |  |
Term Loan | LIBOR | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument applicable margin | 3.50% |  |
Term Loan | Base Rate | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument applicable margin | 1.25% |  |
Term Loan | Base Rate | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument applicable margin | 2.50% |  |
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum borrowing capacity |  |  | 75,000,000
Long-term outstanding borrowings | $ 19,100,000 | 24,500,000 |
Unamortized transaction costs | $ 900,000 | $ 900,000 |
Line of credit facility, swingline sublimit |  |  | $ 10,000,000
Debt instrument, percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights | 100.00% |  |
Debt instrument, percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment | 100.00% |  |
Debt instrument, percentage of excess cash flow to be used for mandatory prepayment starting next fiscal year | 50.00% |  |
Debt instrument, step-down percentage | 0.00% |  |
Debt instrument covenant leverage ratio | 275.00% |  |
Debt instrument, percentage of net cash proceeds from issuances of permitted equity securities to be used for mandatory prepayment | 100.00% |  |
Revolving Credit Facility | Federal Funds Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 0.50% |  |
Revolving Credit Facility | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 1.00% |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 2.25% |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 3.50% |  |
Revolving Credit Facility | Base Rate | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 1.25% |  |
Revolving Credit Facility | Base Rate | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument variable interest rate | 2.50% |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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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 The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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