Property and Equipment, Net - Components of Company's Property and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 85,465 | $ 93,374 |
| Accumulated depreciation | (48,967) | (62,957) |
| Property and equipment, net | 36,498 | 30,417 |
| Leasehold Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 40,583 | 43,930 |
| Office Furniture, Fixtures and Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 16,234 | 18,693 |
| Computer Equipment and Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 28,648 | $ 30,751 |