Is there a solution for an intrustion detection system on the AWS platform? Would you have to go 3rd party or do they have their own offering?
Thanks!
Your question is very general. IDS systems look a bit different in the cloud compared to on-premise "traditional" setups and AWS provides a wide array of options in the security area for example: IAM, CloudTrail & VPC Flow Logs. They can serve as building blocks for IDS depending on what you want to achieve.
If you are asking about more "traditional" IDS systems (network-sniffing boxes), there are lots of solutions available on AWS Marketplace via partners, for example: Sophos, AlertLogic, TrendMicro, CloudPassage.
The best recommendation I could give you is watching below videos to get a better overview what are your options:
AWS re:Invent 2015 | (SEC205) Learn How to Hackproof Your Cloud Using Native AWS Tools
AWS re:Invent 2014 | (SEC402) Intrusion Detection in the Cloud
Intrusion Detection in the Cloud (SEC402) | AWS re:Invent 2013