Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Balance at beginning of Year $ 4,739 $ 4,774
Charged to costs and expenses 5,234 5,774
Deductions (5,236) (5,809)
Balance at end of Year $ 4,737 $ 4,739