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Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts Receivable [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 6,472 $ 9,678 $ 8,657
Charged to Expense 16,620 15,045 19,897
Deductions (17,955) (18,251) (18,876)
Balance at End of Year $ 5,137 $ 6,472 $ 9,678