Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments, Fair Value, and Concentrations of Credit Risk - Additional Information (Detail)

v3.19.1
Financial Instruments, Fair Value, and Concentrations of Credit Risk - Additional Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Concentration of Risk, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair value of financing leases $ 15.6 $ 15.8
Financing lease obligations $ 18.4 $ 18.5