Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Restatement (Details)

v2.4.0.8
Summary of Significant Accounting Policies - Restatement (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Net revenue $ 126,252,694 $ 164,099,905 $ 236,388,217 $ 310,673,274  
Direct expenses 102,870,118 132,942,044 191,486,770 250,291,603  
Operating expenses 25,291,596 22,899,237 48,892,964 48,698,257  
Total expenses   155,841,281   298,989,860  
Operating income (1,909,020) 8,258,624 (3,991,517) 11,683,414  
Other expenses, net 448,732 1,412,744 913,045 2,520,483  
Income before provision for income taxes (2,357,752) 6,845,880 (4,904,562) 9,162,931  
Income tax provision (577,001) 2,026,630 (1,199,739) 2,608,517  
Net (loss) income (1,780,751) 4,819,250 (3,704,823) 6,554,414 6,554,414
Basic (in usd per share) $ (0.04) $ 0.11 $ (0.08) $ 0.15  
Diluted (in usd per share) $ (0.04) $ 0.10 $ (0.08) $ 0.14  
Basic (in shares) 45,465,529 44,541,025 45,396,765 44,343,059  
Diluted (in shares) 45,465,529 46,359,323 45,396,765 46,143,932  
Scenario, Previously Reported [Member]
          
Net revenue   164,099,905   310,673,274  
Direct expenses   132,942,044   250,291,603  
Operating expenses   22,899,237   48,698,257  
Total expenses   155,841,281   298,989,860  
Operating income   8,258,624   11,683,414  
Other expenses, net   1,063,126   2,400,731  
Income before provision for income taxes   7,195,498   9,282,683  
Income tax provision   2,026,630   2,608,517  
Net (loss) income   5,168,868   6,674,166  
Basic (in usd per share)   $ 0.12   $ 0.15  
Diluted (in usd per share)   $ 0.11   $ 0.14  
Basic (in shares)   44,541,025   44,343,059  
Diluted (in shares)   46,359,323   46,143,932  
Restatement Adjustment [Member]
          
Net revenue   0   0  
Direct expenses   0   0  
Operating expenses   0   0  
Total expenses   0   0  
Operating income   0   0  
Other expenses, net   349,618   119,752  
Income before provision for income taxes   (349,618)   (119,752)  
Income tax provision   0   0  
Net (loss) income   $ (349,618)   $ (119,752)  
Basic (in usd per share)   $ (0.01)   $ 0.00  
Diluted (in usd per share)   $ (0.01)   $ 0.00  
Basic (in shares)   44,541,025   44,343,059  
Diluted (in shares)   46,359,323   46,143,932