Quarterly report pursuant to sections 13 or 15(d)

Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)

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Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)
 6 Months Ended
Jun. 30, 2013
Preferred shares  
Preferred Stock, shares authorized 10,000,000
Preferred Stock, shares outstanding 0
Class A Common Stock [Member]
  
Common shares  
Common stock, shares authorized 50,000,000
Common stock, shares outstanding 4,790,694
Common stock voting rights 1 vote per share
Class B Common Stock [Member]
  
Common shares  
Common stock, shares authorized 25,000,000
Common stock, shares outstanding 6,459,316
Common stock voting rights 1 vote per share