Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Stockholders' Equity - Summary of Authorized and Outstanding Equity (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 12, 2013
Preferred shares      
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding  
Class A Common Stock      
Common shares      
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		50,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Common stock, shares outstanding 7,768,010us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		7,522,974us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		5,509,297us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock, voting rights 1 vote per share    
Class B Common Stock      
Common shares      
Common stock, shares authorized 25,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		25,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		 
Common stock, shares outstanding 4,520,413us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		4,464,617us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		 
Common stock, voting rights 1 vote per share