Distributions - Additional Information (Detail) (USD $)	0 Months Ended																	9 Months Ended										0 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 02, 2014	Aug. 08, 2014	Aug. 04, 2014	Jul. 22, 2014	Jul. 01, 2014	Jun. 25, 2014	Jun. 01, 2014	May 25, 2014	May 01, 2014	Apr. 21, 2014	Apr. 03, 2014	Mar. 25, 2014	Mar. 03, 2014	Feb. 24, 2014	Feb. 04, 2014	Jan. 28, 2014	Sep. 30, 2014	Sep. 30, 2013	Aug. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	May 31, 2014	Apr. 30, 2014	Mar. 31, 2014	Feb. 28, 2014	Jan. 31, 2014	Nov. 04, 2014 Subsequent Event [Member]	Oct. 21, 2014 Subsequent Event [Member]	Oct. 01, 2014 Subsequent Event [Member]	Oct. 31, 2014 Subsequent Event [Member]	Sep. 30, 2014 February 24, 2014 [Member]	Sep. 30, 2014 March 25, 2014 [Member]	Sep. 30, 2014 April 21, 2014 [Member]	Sep. 30, 2014 May 25, 2014 [Member]	Sep. 30, 2014 June 25, 2014 [Member]	Sep. 30, 2014 July 22, 2014 [Member]	Sep. 30, 2014 August 08, 2014 [Member]	Sep. 30, 2014 September 30, 2014 [Member]	Sep. 30, 2014 January 28, 2014 [Member]	Sep. 30, 2014 Period Start [Member] February 24, 2014 [Member]	Sep. 30, 2014 Period Start [Member] March 25, 2014 [Member]	Sep. 30, 2014 Period Start [Member] April 21, 2014 [Member]	Sep. 30, 2014 Period Start [Member] May 25, 2014 [Member]	Sep. 30, 2014 Period Start [Member] June 25, 2014 [Member]	Sep. 30, 2014 Period Start [Member] July 22, 2014 [Member]	Sep. 30, 2014 Period Start [Member] August 08, 2014 [Member]	Sep. 30, 2014 Period Start [Member] September 30, 2014 [Member]	Sep. 30, 2014 Period Start [Member] January 28, 2014 [Member]	Sep. 30, 2014 Period End [Member] February 24, 2014 [Member]	Sep. 30, 2014 Period End [Member] March 25, 2014 [Member]	Sep. 30, 2014 Period End [Member] April 21, 2014 [Member]	Sep. 30, 2014 Period End [Member] May 25, 2014 [Member]	Sep. 30, 2014 Period End [Member] June 25, 2014 [Member]	Sep. 30, 2014 Period End [Member] July 22, 2014 [Member]	Sep. 30, 2014 Period End [Member] August 08, 2014 [Member]	Sep. 30, 2014 Period End [Member] September 30, 2014 [Member]	Sep. 30, 2014 Period End [Member] January 28, 2014 [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Dividend distribution period																																									Feb. 01, 2014	Mar. 01, 2014	Apr. 01, 2014	May 01, 2014	Jun. 01, 2014	Jul. 01, 2014	Aug. 01, 2014	Sep. 01, 2014	Jan. 01, 2014	Feb. 28, 2014	Mar. 31, 2014	Apr. 30, 2014	May 31, 2014	Jun. 30, 2014	Jul. 31, 2014	Aug. 31, 2014	Sep. 30, 2014	Jan. 31, 2014
Distribution declared per unit	$ 0.00197808		$ 0.00197808		$ 0.00197808		$ 0.00197808		$ 0.00197808		$ 0.00173082		$ 0.00173082		$ 0.00173082		$ 0.00173082												$ 0.00197808
Cash paid for distributions		$ 186,607		$ 152,386		$ 128,489		$ 120,880		$ 97,345		$ 95,043		$ 83,752		$ 71,184		$ 1,137,257	$ 46,682									$ 236,099		$ 201,571
Reinvestment under distribution reinvestment plan																		$ 90,994		$ 80,373	$ 71,215	$ 59,962	$ 51,552	$ 40,089	$ 30,466	$ 19,925	$ 21,091				$ 106,509
Dividends distribution declared date																																Feb. 24, 2014	Mar. 25, 2014	Apr. 21, 2014	May 25, 2014	Jun. 25, 2014	Jul. 22, 2014	Aug. 08, 2014	Sep. 30, 2014	Jan. 28, 2014