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Commitments and Contingencies- Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2017
Feb. 28, 2017
Operating And Capital Leased Assets [Line Items]    
Increase in future lease commitments   $ 6.0
Purchase commitment, payable period   9 years
Lease Commencement, August 2017 [Member]    
Operating And Capital Leased Assets [Line Items]    
Lease agreement period 19 years  
Renewal term 10 years 6 months  
Lease commencement date 2017-08  
Rent payable $ 10.9