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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Schedule Of Income Tax [Line Items] |  |  |  |
Valuation allowance resulting in income tax benefit | $ 9,487 | $ 9,487 | $ 13,725 |
Unrecognized stock-based compensation | 118,895 | 118,895 |  | 111,635
NOLs deemed worthless |  | 3,487 |  |
Deferred tax asset related to NOLs | 0 | 0 |  |
Income tax expense/(benefit) | 9,531 | (4,194) |  |
Gross deferred tax asset | 4,238 | 4,238 |  |
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation | 5,293 | 5,293 |  |
NOLs available for deferred tax asset | 20,882 | 20,882 |  |
U.K. Subsidiaries [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
NOLs available for deferred tax asset | 816 | 816 |  |
Deferred tax asset related to NOLs, valuation allowance | $ 163 | $ 163 |  |

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