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Senior Debt - Summary of Debt (Parenthetical) (Detail) - 12 months ended Dec. 31, 2016 $ in Millions | USD ($) | EUR (€)
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Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Term loans, year of maturity | 2016-01 | 2016-01
Interest rate | 3.82% | 3.82%
U S Dollar Euro [Member] |  |
Debt Instrument [Line Items] |  |
Outstanding borrowings, quarterly principal installments payable amount | € |  | € 25,000
Term Loan [Member] | Debt Instrument, Redemption, through September 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Outstanding borrowings, quarterly principal installments payable amount | $ 1.7 |
Term loans, year of maturity | 2017-09 | 2017-09
Term Loan [Member] | Debt Instrument, Redemption, through September 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Outstanding borrowings, quarterly principal installments payable amount | $ 2.3 |
Term loans, year of maturity | 2018-09 | 2018-09
Term Loan [Member] | Debt Instrument, Redemption, through September 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Outstanding borrowings, quarterly principal installments payable amount | $ 2.9 |
Term loans, year of maturity | 2020-09 | 2020-09

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