Annual report pursuant to Section 13 and 15(d)

Our Portfolio - Summary of Outstanding Deferred Funding Obligations to be Paid (Detail)

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Our Portfolio - Summary of Outstanding Deferred Funding Obligations to be Paid (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
2018 $ 97,000  
2019 35,000  
2020 16,000  
2021 5,000  
Total $ 153,308 $ 170,892