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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
	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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- References

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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

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Average amount borrowed under the credit facility during the period.

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

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