Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Total Accounts and Notes Receivable (Detail)

v3.8.0.1
Summary of Significant Accounting Policies - Summary of Total Accounts and Notes Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Trade $ 130,075 $ 121,490
Allowance for bad debts (7,564) (8,259)
Total accounts and notes receivable, net of allowance for bad debt $ 122,511 $ 113,231