@foreach ($list_1->blockDetail as $k => $v)
@if ($k > 0 && ($k % 3) == 0)
@foreach ($list_2->blockDetail as $key => $val)
@if (($key) == (($k / 3) - 1))
@endif
@endforeach
@endif
@endforeach
@foreach ($list_2->blockDetail as $k => $v)
@if (floor(count($list_1->blockDetail) / 3) <= $k)
@endif
@endforeach