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Debt - Additional Information (Detail) - SunTrust Bank [Member] - USD ($) |  | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019
Line of Credit Facility [Line Items] |  |
Description of Line of credit facility Covenant |  | A funded debt leverage ratio (consolidated debt/consolidated EBITDA) of not greater than 3.0 to 1.0; and an interest coverage ratio (consolidated EBITDA/consolidated interest expense) of not less than 3.0 to 1.0.
Minimum [Member] |  |
Line of Credit Facility [Line Items] |  |
Commitment fee paid per annum | 0.20% |
Maximum [Member] |  |
Line of Credit Facility [Line Items] |  |
Commitment fee paid per annum | 0.30% |
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Maturity date of Loan agreement | Nov. 24, 2020 |
Interest rate under credit facility |  | the borrowings under the Revolving Credit Facility bear interest at either (1) a rate per annum equal to the highest of SunTrust’s prime rate or 0.5% in excess of the Federal Funds Rate or 1.0% in excess of one-month LIBOR (the “Base Rate”), plus an applicable margin, or (2) the one, two, three, or six month per annum LIBOR for deposits in the applicable currency (the “Eurocurrency Rate”), as selected by the Company, plus an applicable margin. The applicable margin for Eurocurrency Rate loans depends on the Company’s funded debt leverage ratio and varies from 1.50% to 2.00%. The applicable margin for Base Rate loans depends on the Company’s funded debt leverage ratio and varies from 0.50% to 1.50%
Maximum borrowing capacity under credit facility | $ 50,000,000.0 |
Increase in revolving credit facility | 25,000,000.0 |
Principal payments prior to maturity | 0 |
Outstanding balance on revolving credit facility |  | $ 0
Revolving Credit Facility [Member] | Swing Line Sub Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility | 5,000,000.0 |
Revolving Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity under credit facility | $ 5,000,000.0 |
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Interest Rate During Period | 0.50% |
Revolving Credit Facility [Member] | Base Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Interest Rate During Period | 1.00% |
Revolving Credit Facility [Member] | Minimum [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest coverage ratio | 300.00% |
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Applicable margin for loans | 0.50% |
Revolving Credit Facility [Member] | Minimum [Member] | Eurodollar [Member] |  |
Line of Credit Facility [Line Items] |  |
Applicable margin for loans | 1.50% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt leverage ratio | 300.00% |
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Applicable margin for loans | 1.50% |
Revolving Credit Facility [Member] | Maximum [Member] | Eurodollar [Member] |  |
Line of Credit Facility [Line Items] |  |
Applicable margin for loans | 2.00% |

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- Definition Interest coverage ratio. + References No definition available. + Details
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- Definition Line Of Credit Facility Increased Facility Size Due To Accordion Feature + References No definition available. + Details
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- Definition Line Of Credit Facility Percentage Of Applicable Margin For Borrowings + References No definition available. + Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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