  The worldwide advanced gravitational-wave (GW) detector network has so far
primarily consisted of the two Advanced LIGO observatories at Hanford and
Livingston, with Advanced Virgo joining the 2016-7 O2 observation run at a
relatively late stage. However Virgo has been observing alongside the LIGO
detectors since the start of the O3 run; in the near future, the KAGRA detector
will join the global network and a further LIGO detector in India is under
construction. Gravitational-wave search methods would therefore benefit from
the ability to analyse data from an arbitrary network of detectors. In this
paper, we extend the PyCBC offline compact binary coalescence (CBC) search
analysis to three or more detectors, and describe resulting updates to the
coincident search and event ranking statistic. For a three-detector network,
our improved multi-detector search finds 23% more simulated signals at fixed
false alarm rate in idealized colored Gaussian noise, and up to 40% more in
real data, compared to the two-detector analysis previously used during O2.
