The acquisition of Hydrock by Stantec is likely to have a positive short-term impact on STN's stock price due to the expansion of its engineering and design services. This move could enhance Stantec's competitive edge in the market, potentially leading to increased revenue and market share. The undisclosed amount suggests a strategic acquisition, and the integration of Hydrock's 950-person team indicates a significant expansion of Stantec's capabilities and resources.