Quarterly report pursuant to sections 13 or 15(d)

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

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Organization and Business - Schedule of Basic and Diluted Earnings per Share (Parenthetical) (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]        
Diluted weighted average units outstanding, contingently issuable units 237,089 146,452 237,089 146,452