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Indebtedness - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2019 | Jun. 30, 2017 | Dec. 31, 2018 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Short term debt |  | $ 0 |  | $ 0 |
Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available borrowings capacity under credit agreement |  |  |  |  | $ 124,936,000
Senior secured credit facility, maturity date |  |  | Jun. 30, 2022 |  |
Credit agreement, covenant description |  | The Credit Agreement contains two key financial covenants; namely, borrowers are required to maintain a Consolidated Funded Debt Ratio of no more than 3.25-to-1 and a Consolidated Fixed Charge Covenant Ratio of at least 1.25-to-1. |  |  |
Credit agreement, variable rate description |  | Under the Credit Agreement, revolving loans bear interest at a variable rate based, at borrower’s election with proper notice, on either (i) LIBOR plus the “Applicable Rate” which is based upon the Consolidated Funded Debt Ratio (“Eurocurrency Rate Loan”) or (ii) the greater of (x) the Prime Rate, (y) the Federal Funds Rate plus 0.5%, and (z) the Daily One-Month LIBOR Rate plus 1.00%, plus, in the case of (x), (y) or (z) the Applicable Rate (“Alternate Base Rate Loan”). |  |  |
Federal Funds Rate | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate basis | 0.50% |  |  |  |
One-Month LIBOR Rate | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate basis | 1.00% |  |  |  |
Eurocurrency Rate | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, interest payment period, description |  | last day of each interest period (either one, two, three or six months, as selected by the borrower) |  |  |
Alternate Base Rate | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, interest payment period, description |  | last business day of each month |  |  |
Maximum | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available borrowings capacity under credit agreement | $ 250,000,000 |  | $ 250,000,000 |  |
Consolidated funded debt ratio | 325.00% |  |  |  |
Capacity to increase borrowings under credit agreement |  | $ 56,707,000 |  |  |
Maximum | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accordion feature | $ 100,000,000 |  | $ 100,000,000 |  |
Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated fixed charge covenant ratio | 125.00% |  |  |  |

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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + 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 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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