Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Breakdown between Current and Deferred Income Taxes (Detail)

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Summary of Significant Accounting Policies - Breakdown between Current and Deferred Income Taxes (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]                      
Current portion                   $ (268,356) $ 181,168
Deferred portion                 (743,676) 568,675 (173,657)
Total income taxes $ 1,328,297 $ 85,406 $ 46,838 $ 59,189 $ 85,396 $ 19,900 $ 101,193 $ 93,830 $ 1,519,730 $ 300,319 $ 7,511