Financial Highlights - Schedule of Financial Highlights (Parenthetical) (Detail)	7 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Schedule Of Financial Highlights [Line Items]
Weighted average units outstanding	796,318.386	22,160.665	455,812.023
Ratio of net investment income to average net assets	5.52%
Ratio of operating expenses to average net assets	0.79%
Scenario, Previously Reported [Member]
Schedule Of Financial Highlights [Line Items]
Total return to average net assets	(10.82%)
Ratio of net investment income to average net assets	(20.22%)
Ratio of operating expenses to average net assets	26.54%