Shares of 51job (NASDAQ: JOBS) hit a new all-time high on Wednesday, earning it on Thursday by posting another period of accelerating revenue growth. The Shanghai-based provider of online recruitment services came through with its strongest top-line growth since 2011 -- on widening margins to boot. Revenue at 51job rose 20.3% to $99.3 million for the third quarter, well ahead of the $93 million to $95.9 million that it was targeting back in May. You have to go all the way back to the fourth quarter of 2011 to find the last time that year-over-year growth has risen north of 20%. The pace of 51job's revenue growth continues to accelerate. We've seen the year-over-year upticks go from 10.2% during last year's second quarter to 13.3%, 13.6%, 16%, and now 20.3% in subsequent periods. Image source: 51job. Getting the job done 51job's business can be divided in two segments, and the market darling is coming through with double-digit percentage growth on both fronts. Online recruitment services -- accounting for 66% of its revenue -- rose 19% during the period. Other human resource-related revenue grew by an even better 22.8%. Results over the past year had been held back by a value-added tax or VAT policy change that went into effect in May of last year. We lapped that results-sandbagging change midway through the second quarter, making it easier for 51job to show its true colors from now on. It was a period of expanding margins. Gross and operating margins widened, culminating in a 47% surge in operating income. Adjusted earnings clocked in at $0.49 a share, also besting its earlier forecast for adjusted earnings per share of $0.41 to $0.44 for the second quarter. 51job is eyeing another period of growth, looking to post top-line results in the nine figures -- on a dollar-basis -- for the first time during the current quarter. 51job's outlook for the third quarter calls for an adjusted profit of $0.46 to $0.49 a share on $101 million to $104 million in revenue. We'll be looking at decelerating top-line growth even if it lands at the high-end of its range, but it would still be the company's tenth straight quarter of double-digit revenue growth. Another big milestone hit by 51job is that its balance sheet topped $1 billion in cash and short-term securities -- $1.03 billion -- by the end of the quarter. Chinese companies keep hiring, and clearly they're turning to 51job's platform to help fill many of those jobs. 10 stocks we like better than 51jobWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and 51job wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of August 1, 2017Rick Munarriz has no position in any stocks mentioned. The Motley Fool recommends 51job. The Motley Fool has a disclosure policy.