|
CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Statement Of Financial Position [Abstract] |
|
|
| Accounts receivable, allowance for doubtful accounts |
$ 10,448,000 |
$ 10,393,000 |
| Property and equipment, accumulated depreciation |
99,111,000 |
68,756,000 |
| Intangible assets, accumulated amortization |
35,270,000 |
25,715,000 |
| Common stock, par value |
$ 0.01 |
$ 0.01 |
| Common stock, shares authorized |
180,000,000 |
180,000,000 |
| Common stock, shares outstanding |
38,648,000 |
38,166,000 |
| Consolidated assets, include variable interest entity |
117,500,000 |
49,500,000 |
| Consolidated liabilities, include variable interest entity |
23,800,000 |
12,200,000 |
| Debt guaranteed |
$ 3,400,000 |
$ 4,000,000 |