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Equity - Class A Common Shares Reserved for Future Issuance (Detail)
Dec. 31, 2017
shares
Class of Stock [Line Items]  
Total shares reserved for future issuance 6,836,348
Stock Option [Member]  
Class of Stock [Line Items]  
Total shares reserved for future issuance 567,100
Restricted Stock Units [Member]  
Class of Stock [Line Items]  
Total shares reserved for future issuance 869,248
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