Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Information on Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Detail)

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Debt Obligations - Information on Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Line of Credit Facility [Abstract]    
Maximum amount outstanding under the credit facility during the period $ 490,995 $ 518,607
Average daily amount outstanding under the credit facility $ 409,481 $ 472,029
Weighted-average interest rate 2.61% 2.00%