Income Taxes - Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Deferred Tax assets: | ||
| Deferred customer billings | $ 220,075 | $ 181,567 |
| Net operating loss carryforwards | 48,201 | 41,654 |
| Share-based compensation | 24,995 | 33,895 |
| Accrued bonus | 2,008 | 3,791 |
| Other reserves | 606 | 1,019 |
| Alternative minimum tax | 1,537 | 1,185 |
| Other | 2,446 | 1,235 |
| Fixed assets | 435 | 0 |
| R&D credit | 189 | 711 |
| Charitable contributions | 534 | 514 |
| Stock warrants | 101 | 127 |
| Total gross deferred tax assets | 301,127 | 265,698 |
| Less valuation allowance | (302) | (299) |
| Net deferred tax assets | 300,825 | 265,399 |
| Deferred tax liabilities: | ||
| Goodwill and fixed assets | 0 | (817) |
| Total deferred tax liability | 0 | (817) |
| Net deferred tax asset | $ 300,825 | $ 264,582 |