Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail)

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Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Balance at beginning of Year $ 4,737 $ 4,739
Charged to costs and expenses 5,631 5,234
Deductions (5,379) (5,236)
Balance at end of Year $ 4,989 $ 4,737