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Indebtedness - Additional Information (Detail) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |
Short term debt |  | $ 0 | $ 0 |
Senior secured credit facility, maturity date | Jun. 30, 2022 |  |  |
Revolving Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowings capacity under credit agreement |  |  |  | $ 95,985,000
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available borrowings capacity under credit agreement | $ 250,000,000 |  |  |
Consolidated funded debt ratio | 325.00% |  |  |
Maximum | Revolving Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capacity to increase borrowings under credit agreement |  | $ 124,724,000 |  |
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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