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Indebtedness - Additional Information (Detail) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Short term debt |  | $ 0 | $ 0 |
Senior secured credit facility, maturity date | Jun. 30, 2022 |  |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowings capacity under credit agreement |  |  |  | $ 119,994,000
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowings capacity under credit agreement | $ 250,000,000 |  |  |
Consolidated funded debt ratio | 325.00% |  |  |
Maximum | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity to increase borrowings under credit agreement |  | $ 124,936,000 |  |
Maximum | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accordion feature | $ 100,000,000 |  |  |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated fixed charge covenant ratio | 125.00% |  |  |

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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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