Quarterly report pursuant to Section 13 or 15(d)

Prepaid and Other Current and Non-current Assets - Additional Information (Detail)

v3.8.0.1
Prepaid and Other Current and Non-current Assets - Additional Information (Detail)
9 Months Ended
Sep. 30, 2017
option
Operating Leased Assets [Line Items]  
Term of lease (in years) 4 years
Term of lease extension (in years) 20 years
Term of lease renewals (in years) 5 years
Number of renewal options for operating leases 6
Texas  
Operating Leased Assets [Line Items]  
Term of lease (in years) 10 years
Maximum  
Operating Leased Assets [Line Items]  
Term of lease (in years) 60 years