Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Prepaid and Other Current and Non-current Assets - Additional Information (Detail) - Renewal_Options
6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Operating Leased Assets [Line Items]    
Term of lease 4 years  
Term of lease extension 20 years  
Term of lease renewals 5 years  
Number of renewal options for operating leases 6  
Texas [Member]    
Operating Leased Assets [Line Items]    
Term of lease   10 years
Maximum [Member]    
Operating Leased Assets [Line Items]    
Term of lease   60 years