TDE restored DB encryption state
Restoring the database to another server will not result in the data being unencrypted. However, you do need to:

...move the certificate or asymmetric key that is used to open the DEK.
The certificate or asymmetric key must be installed in the master database of the destination server, so that SQL Server can access the database files.
You must retain copies of both the certificate file and the private
key file in order to recover the certificate. The password for the
private key does not have to be the same as the database master key
password.

The following link provides you with the details:
https://msdn.microsoft.com/en-us/library/ff773063(v=sql.120).aspx
Once you have everything set up on the restored database, you can (of course) turn off TDE and let the server eventually de-encrypt the database, if that is your intention.
There is a Very Important Note on removing encryption from a database that is to be restored from SQL Server 2008 or 2008 R2 to another server at:
http://blogs.msdn.com/b/batuhanyildiz/archive/2012/10/16/how-to-enable-remove-transparent-data-encryption-tde.aspx
(This may not matter to you, depending on the source of the restored database.)