Annual report pursuant to Section 13 and 15(d)

Organization and Business - Schedule of Basic and Diluted Earnings per Share (Parenthetical) (Detail)

v3.3.1.900
Organization and Business - Schedule of Basic and Diluted Earnings per Share (Parenthetical) (Detail) - shares
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Diluted weighted average units outstanding, contingently issuable units   146,452
Class B Common Stock    
Diluted weighted average units outstanding, contingently issuable units 228,549