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Summarized Financial Information for Reportable Segments (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Revenues $ 35,521,672 $ 41,534,386 $ 69,930,671 $ 74,759,605  
Gross Profit 5,785,664 8,809,257 13,538,836 16,580,965  
Depreciation and amortization 2,091,447 1,104,154 4,050,749 2,189,099  
Interest income 5,994 13,108 10,710 24,254  
Interest expense 220,761 136,989 425,635 267,055  
Income tax expense 1,273,977 2,104,140 3,100,628 3,975,157  
Net Income (Loss) 3,610,790 5,860,950 8,292,481 10,713,874  
Total Assets 151,817,534   151,817,534   144,957,864
HBOP
          
Segment Reporting Information [Line Items]          
Revenues 33,648,597 39,286,977 66,481,457 70,354,897  
Gross Profit 5,304,652 8,022,937 12,653,547 15,002,549  
Depreciation and amortization 1,854,784 875,775 3,577,083 1,736,312  
Interest income 4,778 8,858 7,464 11,525  
Interest expense 220,761 136,989 425,635 267,055  
Income tax expense 1,162,319 1,913,210 2,895,130 3,591,519  
Net Income (Loss) 3,470,208 5,735,351 8,362,337 10,600,193  
Total Assets 115,010,790   115,010,790   111,305,277
Baoding Shengde
          
Segment Reporting Information [Line Items]          
Revenues 1,873,075 2,247,409 3,449,214 4,404,708  
Gross Profit 481,012 786,320 885,289 1,578,416  
Depreciation and amortization 236,663 228,379 473,666 452,787  
Interest income 1,197 4,138 3,191 12,574  
Income tax expense 111,658 190,930 205,498 383,638  
Net Income (Loss) 332,831 563,827 612,585 1,150,385  
Total Assets 44,924,636   44,924,636   46,180,744
Not Attributable to Segments
          
Segment Reporting Information [Line Items]          
Interest income 19 112 55 155  
Net Income (Loss) (195,425) (438,228) (674,522) (1,036,704)  
Total Assets 281,096   281,096   224,868
Elimination of Inter-segment
          
Segment Reporting Information [Line Items]          
Net Income (Loss) 3,176   (7,919)    
Total Assets $ (8,398,988)   $ (8,398,988)   $ (12,753,025)