Annual report pursuant to Section 13 and 15(d)

Equity - Class A Common Shares Reserved for Future Issuance (Detail)

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Equity - Class A Common Shares Reserved for Future Issuance (Detail)
Dec. 31, 2016
shares
Class of Stock [Line Items]  
Total shares reserved for future issuance 6,751,194
Stock Option [Member]  
Class of Stock [Line Items]  
Total shares reserved for future issuance 522,850
Restricted Stock Units [Member]  
Class of Stock [Line Items]  
Total shares reserved for future issuance 828,344
Class B Common Stock Converted Into Class A Common Stock [Member]  
Class of Stock [Line Items]  
Total shares reserved for future issuance 5,400,000