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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Debt Disclosure [Abstract]
Maximum amount outstanding under the credit facility during the period	$ 601,062	$ 465,599	$ 601,062	$ 518,607
Average daily amount outstanding under the credit facility	$ 518,779	$ 426,172	$ 464,432	$ 449,101
Weighted-average interest rate	2.49%	2.17%	2.54%	2.08%

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- References

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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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.

+ References

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Balance Type:	credit
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