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Senior Debt - Summary of Debt (Parenthetical) (Detail) - Term Loan [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Debt Instrument, Redemption, through September 2017 [Member] |
Debt Instrument [Line Items] |
Outstanding borrowings, quarterly principal installments payable amount | $ 2.0
Term loans, year of maturity | 2018-09
Debt Instrument, Redemption, through September 2020 [Member] |
Debt Instrument [Line Items] |
Outstanding borrowings, quarterly principal installments payable amount | $ 2.5
Term loans, year of maturity | 2020-09

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