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Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Significant Accounting Policies [Line Items]    
Cash and cash equivalents in excess of insured limit $ 39,720,000 $ 39,720,000
Anti-dilutive securities excluded from the calculation of diluted earnings per share 1,392,500 1,392,500
Maximum
   
Significant Accounting Policies [Line Items]    
Cash equivalents, original maturity   3 months
Property and equipment, useful lives   5 years
Minimum
   
Significant Accounting Policies [Line Items]    
Property and equipment, useful lives   3 years