Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable, Net of Allowance for Doubtful Accounts - Additional Information (Detail)

v3.8.0.1
Accounts Receivable, Net of Allowance for Doubtful Accounts - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Selling, General and Administrative Expenses    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Bad debt expense $ 0.1 $ 0.1