We present a measurement of the cosmic microwave background (CMB) lensing potential using 500 deg\(^2\) of 150 GHz data from the SPTpol receiver on the South Pole Telescope. The lensing potential is reconstructed with signal-to-noise per mode greater than unity at lensing multipoles \(L \lesssim 250\), using a quadratic estimator on a combination of CMB temperature and polarization maps. We report measurements of the lensing potential power spectrum in the multipole range of \(100< L < 2000\) from sets of temperature-only, polarization-only, and minimum-variance estimators. We measure the lensing amplitude by taking the ratio of the measured spectrum to the expected spectrum from the best-fit \(\Lambda\)CDM model to the \(\textit{Planck}\) 2015 TT+lowP+lensing dataset. For the minimum-variance estimator, we find \(A_{\rm{MV}} = 0.944 \pm 0.058{\rm (Stat.)}\pm0.025{\rm (Sys.)}\); restricting to only polarization data, we find \(A_{\rm{POL}} = 0.906 \pm 0.090 {\rm (Stat.)} \pm 0.040 {\rm (Sys.)}\). Considering statistical uncertainties alone, this is the most precise polarization-only lensing amplitude constraint to date (10.1 \(\sigma\)), and is more precise than our temperature-only constraint. We perform null tests and consistency checks and find no evidence for significant contamination.