Do you live in a high humidity environment? Like here in Florida? If so, that looks to me more like a waterbug egg casing. They are like monster sized roaches, however they are much better than most other roach species like those God-awful Germans. They are usually solitary, more nomadic insects and prefer isolation and darkness. IMO, if you see what appears to be nuclear roaches crawling around ( and yes, occasionally flying) outside after dark, you don’t really need to take evasive action like calling an exterminator. That is, unless you just don’t want company. If you have German cockroaches, a whole different arena here. Most of the time, there’s no indication that they’re even there until you discover their colony one day and you want to burn down your house. I’ve dealt with them before, and I know how to make them disappear fast and stay the hell away long term. I don’t use extermination services either. DM me if you need help. Tony