Schedule II, Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Allowance for doubtful accounts | |||
| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Year | $ 6,004 | $ 5,306 | $ 4,131 |
| Charged to Costs and Expenses | 4,501 | 4,302 | 3,349 |
| Deductions | (5,582) | (3,604) | (2,174) |
| Balance at End of Year | 4,923 | 6,004 | 5,306 |
| Valuation allowance on deferred taxes | |||
| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Year | 18,991 | 16,802 | 171,062 |
| Charged to Costs and Expenses | 517 | 2,189 | 0 |
| Deductions | (2,335) | 0 | (154,260) |
| Balance at End of Year | $ 17,173 | $ 18,991 | $ 16,802 |