Annual report pursuant to Section 13 and 15(d)

Related Party Transactions Schedule of Information about Fees Earned (Detail)

v3.8.0.1
Related Party Transactions Schedule of Information about Fees Earned (Detail) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Nov. 30, 2017
Nov. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Related Party Transaction [Line Items]        
Gross Proceeds from Fee Received     $ 15,685
Less: $ 2,700 $ 100 1,265  
Proceeds from Fees Received     14,420 1,265
Fortress [Member]        
Related Party Transaction [Line Items]        
Gross Proceeds from Fee Received     2,836 0
Avenue [Member]        
Related Party Transaction [Line Items]        
Gross Proceeds from Fee Received     2,331 0
Mustang [Member]        
Related Party Transaction [Line Items]        
Gross Proceeds from Fee Received     9,527 1,265
Caelum [Member]        
Related Party Transaction [Line Items]        
Gross Proceeds from Fee Received     $ 991 $ 0