I dont understand my dogs urination!

Question
Would you think that being able to go 10-12 hours through the night is conducive to a kidney problem or diabetes though? Surely that would cause him to wake up and need the loo in the night. He sleeps in my bedroom and the door is closed so he cant go anywhere else.
Could it just be down to his age and something he'll grow out of? I'm thinking of getting a litter tray for the time being, at least then I can hope to train him to use it and give him the option to urinate elsewhere in the house.
I forgot to mention earlier that the house we live in has no garden as its in the centre of town. My front door opens onto a market place. The previous owner had a garden and he could use it as he liked. However as i said earlier they had the same issues with him despite the addition of a garden area.
Thankyou sooo much for your prompt reply! I really want whats best for him and urinating in the house isn't doing either of us any good!
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The text above is a follow-up to ...

-----Question-----
I have a male neutered Jack Russell Terrier who will be 2 years old in a months time. I have only had him a week, but have known for him for some weeks previous and we already have a strong bond.
The previous owner had him as a rescue dog for  5 months before me and had similar problems. The problem is this: he urinates around the house, despite having just been walked or not being apparently over-excited. So far he has urinated around a dozen times in the house, mostly in the living room or hallway. He has urinated twice whilst standing on the sofa (I allow him on the furniture). I have witnessed all the occurrences myself, only one of which had him cocking his leg. It doesn't appear to me to be submissive urination; we have a strong bond, I and my housemates give him ample affection, he gets up to 4 walks a day.
What I don't understand is that he can go 10-12 hours overnight without urinating, and never urinates in the van (I take him to work with me), also he never urinates in my bedroom (where he sleeps).
When I have caught him in the act I tell him 'No' in a stern voice, sometimes he stops, sometimes he carries on urinating but moves away from the spot he started at.
Do you think this is a behavioral problem or could he maybe have diabetes or a kidney issue?
-----Answer-----
Well, he could have a kidney issue as you suggested, so you could call a vet and ask their opinion on the problem. It sounds to me like hes marking his territory but, he hasn't done anything in his room? Thats the first place I would think he'd start. I hope this helps =]
Feel Free To Follow Up.

Answer
that is a problem of my thought: not going for hours.
As I said, you could call and ask your vet; he could be marking his territory; or maybe, he may sense something by smell or sound that we cannot and it could scare or tempt him ..... something like that - and then he goes automatically. I do hope this helps =]
Feel Free To Follow Up.