Consistency is usually a treat. When you go in for a spa treatment at one of Steiner Leisure's (NASDAQ:STNR) shipboard or resort hotel pampering facilities, you hope your expectations will be exceeded. That's just the way the company's quarters have gone, and last night, Steiner posted its 12th consecutive quarter of surpassing Wall Street's profit target.

The company, whose stock has climbed by 43% since being singled out in our Rule Breakers newsletter service, earned $0.48 a share on a 17% uptick in March quarter revenues. Although earnings growth was flat on a diluted share basis, the showing did come ahead of the $0.47 a stub that analysts had been expecting.

It was a strong quarter, with revenues climbing at its floating and land-based spas as well as its booming consumer products division. The company did suffer a slight dip at its spa training schools, but that has always been the smallest piece of the revenue pie at Steiner.

While Steiner is a proxy for various travel industries -- it also runs land-based resort spas for the likes of Hilton (NYSE:HLT) and Marriott (NYSE:MAR) -- it is clearly riding the wave of the cruise industry's revival. Not only does it operate twice as many shipboard spas as it does resort locations, but also the average floating facility took in $56,255 a week, or nearly twice as much as the land-based spas.

You will find Steiner on most boats run by Carnival (NYSE:CCL), Royal Caribbean (NYSE:RCL), NCL, and Disney (NYSE:DIS). Things have been going so well that the companies have been handing over even more ships into Steiner's soothing hands. As a result, the company closed out the March quarter with 115 ships, nine more than it had at this time last year.

Sure, some growth stock investors may prefer the higher-octane recommendations that we've made in our Rule Breakers newsletter, but Steiner offers an unconventional way to play the most lucrative angle in the growing cruise sector. Younger passengers are spending more, and Steiner is there to collect the benefits.

Need some more reading while you hang out on the massage table?

Longtime Fool contributor Rick Munarriz has been a Steiner customer on the Disney Wonder, and although he does own shares in Disney, he does not own shares in any of the other companies mentioned in this story. The Fool has a disclosure policy. He is also part of the Rule Breakers newsletter research team, seeking out tomorrow's ultimate growth stocks a day early.