Inc was the largest deal signed this year, according to the Thomson One deals database, but the acqisition is still pending approval by U.S. regulators .
The second-biggest deal in 2012, also announced in December, was the purchase by a consortium of Chinese investors led by New China Trust Co Ltd of International Lease Finance Corp from American International Group.
Part of the surge in OFDI was also likely to have reflected efforts by firms or wealthy individuals to evade China's capital controls.
China's closed capital account mean that Chinese residents are restricted from transferring money overseas if they want to buy financial assets, property, or make direct corporate investments not approved by MOFCOM.
A Reuters analysis showed that hot money outflows accelerated in the second half of 2012.