Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities - Schedule of Additional Detail on Credit Facility (Detail)

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Credit Facilities - Schedule of Additional Detail on Credit Facility (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Outstanding balance $ 406,487 $ 283,346
Value of collateral pledged to credit facility $ 513,000 $ 471,000
Weighted average short-term borrowing rate 2.60% 2.30%