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Summary of Long Term Debt (Parenthetical) (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Available borrowings capacity under credit agreement |  | $ 104,853,000
Senior secured credit facility, maturity date | Jun. 30, 2022 |
Maximum |  |
Debt Instrument [Line Items] |  |
Available borrowings capacity under credit agreement | $ 250,000,000 |
Accordion feature | $ 100,000,000 |
Consolidated funded debt ratio | 325.00% |
Minimum |  |
Debt Instrument [Line Items] |  |
Consolidated fixed charge covenant ratio | 125.00% |

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- Definition Line of credit consolidated fixed charge covenant ratio. + References No definition available. + 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://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 Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + 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 + Details
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