Custom Post query with Page navi

<?php
  $temp = $wp_query;
  $wp_query = null;
  $wp_query = new WP_Query();
  $wp_query->query('showposts=-1&post_type=doctor-items'.'&paged='.$paged);

  while ($wp_query->have_posts()) : $wp_query->the_post();
?>

<?php
    $specilist= get_post_meta($post->ID, 'specilist', true);
    $facebook= get_post_meta($post->ID, 'facebook', true);
    $vimeo= get_post_meta($post->ID, 'vimeo', true);
    $twitter= get_post_meta($post->ID, 'twitter', true);
    $pinterest= get_post_meta($post->ID, 'pinterest', true);
    $google= get_post_meta($post->ID, 'google', true);
    $doctor_photo = wp_get_attachment_image_src('doctor-small' );
?>
    <!-- content -->
<div class="single_doctor">
    <div class="doctor_photo">
        <a href="<?php the_permalink(); ?>"><img src="<?php echo $doctor_photo[0]; ?>" alt="" /></a>
    </div>

    <div class="doctor_right_info">
        <a href="<?php the_permalink(); ?>">
        <h2><?php echo $specilist; ?></h2>
        <h2><?php the_title(); ?></h2>
        </a>
        <p><?php the_excerpt(); ?></p>
    </div>

    <div class="doctor_social_profiles">
        <p>social profiles</p>
        <ul>
            <?php if($vimeo) : ?>
            <li><a href="<?php echo $vimeo; ?>"><i class="fa fa-vimeo-square"></i></a></li>
            <?php endif; ?>

            <?php if($twitter) : ?>
            <li><a href="<?php echo $twitter; ?>"><i class="fa fa-twitter"></i></a></li>
            <?php endif; ?>

            <?php if($facebook) : ?>
            <li><a href="<?php echo $facebook; ?>"><i class="fa fa-facebook"></i></a></li>
            <?php endif; ?>

            <?php if($google) : ?>
            <li><a href="<?php echo $google; ?>"><i class="fa fa-google-plus"></i></a></li>
            <?php endif; ?>

            <?php if($pinterest) : ?>
            <li><a href="<?php echo $pinterest; ?>"><i class="fa fa-pinterest"></i></a></li>
            <?php endif; ?>
        </ul>
    </div>
</div>
<!-- Content -->
<?php endwhile; ?>

<?php if (function_exists('wp_pagenavi')) { wp_pagenavi(); } else { include('navigation.php'); } ?>

<?php
  $wp_query = null;
  $wp_query = $temp;  // Reset
?>