Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair value of financing leases $ 15.8 $ 14.2
Financing lease obligations $ 18.5 $ 10.1