What is the meaning of Psalm 73:12?

Behold, these [are] the ungodly, who prosper in the world; they increase [in] riches. (Psalm 73:12 KJV)

Behold, these are the wicked; And, being alway at ease, they increase in riches. (Psalm 73:12 ASV)

Behold, these are the wicked, and they prosper in the world: they heap up riches. (Psalm 73:12 DBY)

Behold, these are the wicked. Being always at ease, they increase in riches. (Psalm 73:12 WEB)

Lo, these [are] the wicked and easy ones of the age, They have increased strength. (Psalm 73:12 YLT)

Interlinear

Behold, these are the ungodly, <rasha`> who prosper <shalev> in the world; <`owlam> they increase <sagah> in riches. <chayil> (Psalm 73:12 KJV)

Treasury of David

Ver. 12.  Behold, these are the ungodly, who prosper in the world. Look!  See!  Consider!  Here is the standing enigma!  The crux of Providence!  The stumblingblock of faith!  Here are the unjust rewarded and indulged, and that not for a day or an hour, but in perpetuity.  From their youth up these men, who deserve perdition, revel in prosperity.  They deserve to be hung in chains, and chains are hung about their necks; they are worthy to be chased from the world, and yet the world becomes all their own.  Poor purblind sense cries, Behold this!  Wonder, and be amazed, and make this square with providential justice, if you can.  

They increase in riches; or, strength.  Both wealth and health are their dowry.  No bad debts and bankruptcies weigh them down, but robbery and usury pile up their substance.  Money runs to money, gold pieces fly in flocks; the rich grow richer, the proud grow prouder. Lord, how is this?  Thy poor servants, who become yet poorer, and groan under their burdens, are made to wonder at thy mysterious ways.