Zelandakh, on 2014-February-11, 08:25, said:
The default in your scenario is that it simply shows a bunch of hearts and clubs. You can call that a takeout double if you like but it does not have to have traditional takeout double values. However this is a particularly dangerous auction to come in vulnerable so some shape is expected.
I call that a takeout double, asking partner to takeout to one of the unbid suits.

Well, this obviously shows less than an opening bid HCP as would any action by a passed hand, but playing strength should be very good since opponents are in a game forcing auction. And not just a lot of shape, but I would expect some very decent looking suits since partner won't have much and this could go for a telephone number if the opponents have a penalty double.