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Senior Debt - Debt Maturities Relating to Senior Borrowings Outstanding (Detail) - Senior Borrowings Outstanding [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Debt Instrument, Redemption [Line Items]  
2016 $ 0
2017 98,350
2018-2019 0
2020 500,000
Thereafter 400,000
Total $ 998,350