Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
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| 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 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. No definition available.
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| X | ||||||||||
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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