Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of portable storage specialist Mobile Mini (NASDAQ:MINI) (NASDAQ:MINI)climbed 10% today after its quarterly results topped Wall Street expectations.

So what: The stock has soared over the past year on significantly improving fundamentals, and today's first-quarter beat -- adjusted EPS of $0.27 on revenue of $97.9 million versus the consensus of $0.22 and $94.0 million -- suggests that the momentum isn't slowing. In fact, it was the company's ninth consecutive quarter of comparable-period growth in leasing revenues, reinforcing optimism over continued EBITDA margin expansion.

Now what: Looking ahead, the company expects to post comparable period growth in leasing revenues through the rest of 2013. "We see additional opportunity to increase our utilization as we more deeply penetrate our existing markets and expand into new ones," said President and CEO Erik Olsson. "We have a great team of dedicated people focused on delivering outstanding service to our customers, and I am looking forward to working with them as we take Mobile Mini into its next phase of growth."

With the stock now up about 150% over its 52-week lows and trading at a 20-plus forward P/E, however, I'd wait for some of the excitement to fade before buying into that growth.

Interested in more info on Mobile Mini? Add it to your watchlist.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.