<form action="{{ $route }}" method="GET">
    <div class="row">
        <div class="input-group">
            {!! Form::select('search_id', $listForSelect, $search_id, ['class' => 'form-control select2']) !!}
            <div class="input-group-btn">
                <button class="btn btn-primary" type="submit">
                    <span class="glyphicon glyphicon-search"></span>
                </button>
            </div>
        </div>
    </div>
</form>