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Debt Obligations - Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Debt Disclosure [Abstract] |  |  |  |
Maximum amount outstanding under the credit facility during the period | $ 1,003,581 | $ 917,895 | $ 1,053,598 | $ 917,895
Average daily amount outstanding under the credit facility | $ 899,323 | $ 760,418 | $ 836,448 | $ 564,178
Weighted-average interest rate | 3.70% | 2.66% | 3.57% | 2.60%

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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