Quarterly report pursuant to sections 13 or 15(d)

Joint Venture Agreement - Additional Information (Detail)

v2.4.0.8
Joint Venture Agreement - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]  
Initial capital contribution in exchange of membership interest $ 19,089
Joint Venture Agreement [Member]
 
Schedule of Equity Method Investments [Line Items]  
Entered into agreement date Nov. 30, 2011
Percentage of outstanding membership interests in joint venture 50.00%
Fair value of capital contribution in joint venture 6,000,000
Minimum [Member] | Joint Venture Agreement [Member]
 
Schedule of Equity Method Investments [Line Items]  
Initial capital contribution in exchange of membership interest 1,000,000
Maximum [Member] | Joint Venture Agreement [Member]
 
Schedule of Equity Method Investments [Line Items]  
Initial capital contribution in exchange of membership interest $ 6,000,000