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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Line of Credit Facility [Abstract]        
Maximum amount outstanding during the period $ 330,473 $ 83,410 $ 330,473 $ 83,410
Average daily amount outstanding under the credit facility $ 171,638 $ 23,940 $ 132,213 $ 11,983
Weighted-average interest rate 2.01% 2.67% 2.13% 2.67%