He did evil in the eyes of the LORD, following the detestable practices of the nations the LORD had driven out before the Israelites. (NIV)
He [Hezekiah's son] did evil in the sight of the Lord, after the [idolatrous] practices of the [heathen] nations whom the Lord cast out before the Israelites. (AMP)
And he did that which was evil in the sight of the LORD, after the abominations of the heathen, whom the LORD cast out before the children of Israel. (KJV)