class RoleModel extends BaseModel {

protected $table = 'role';
protected $fillable = ['role'];
protected $dates = ['deleted_at'];

public function usuarios() {
    return $this->belongsToMany('MoltareasUsuarioUsuarioModel', 'role_x_usuario',  'idUsuario','idRole')
                    ->withTimestamps();
}
}

class UsuarioModel extends Authenticatable {

use Notifiable;

protected $table = 'usuario';
protected $fillable = [ 'nombre', 'apellido', 'email', 'password', 'idRole'];
protected $hidden = [ 'password', 'remember_token'];
protected $dates = ['deleted_at'];

public function roles() {
    return $this->belongsToMany('MoltareasRoleRoleModel', 'role_x_usuario', 'idRole', 'idUsuario')
                    ->withTimestamps();
}
}

introducir el código aquí

$user = MoltareasUsuarioUsuarioModel::get();

foreach ($user->roles as $role) {
    var_dump($role);
}

#attributes: array:5 [▼
"id" => 1
"role" => "ADMINISTRADOR"
"deleted_at" => null
"created_at" => "2016-10-07 09:57:27"
"updated_at" => "2016-10-07 09:57:27"
]

$users = MoltareasUsuarioUsuarioModel::orderBy('id','ASC')->get();
$users->each(function($users){
        $users->roles;
    })
dd($users);