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Basis of Presentation and Significant Accounting Policies - Schedule of Changes in Carrying Amount of Goodwill (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
|---|---|
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Mar. 31, 2015
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| Goodwill [Roll Forward] | |
| Goodwill - beginning balance | $ 408,988 |
| Goodwill acquired during 2015 | 21,088 |
| Adjustment for prior year transactions | (283) |
| Goodwill - ending balance | $ 429,793 |