Subsequent Events (Details)	1 Months Ended
	Aug. 31, 2012
Non Voting Common Class G [Member]
Subsequent Events (Textual) [Abstract]
Issuance of non-voting equity units of NMH Investment	130,000
Grants of Common Units as equity-based compensation by NMH Investment	130,000
Non Voting Common Class H [Member]
Subsequent Events (Textual) [Abstract]
Issuance of non-voting equity units of NMH Investment	1,200,000
Grants of Common Units as equity-based compensation by NMH Investment	1,000,000