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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Data (Unaudited) [Abstract]                      
Net patient revenues $ 84,881 $ 82,154 $ 81,451 $ 75,807 $ 77,958 $ 76,184 $ 76,470 $ 68,397 $ 324,293 $ 299,009 $ 258,283
Net revenues 86,724 84,049 83,288 77,241 79,390 77,716 78,201 69,767 331,302 305,074 264,058
Operating income 12,611 11,949 13,549 9,185 10,755 11,278 14,221 9,514 47,294 45,768 38,770
Net income including non-controlling interests 8,359 8,064 9,117 6,151 7,263 7,418 9,420 6,323 $ 31,691 $ 30,424 $ 26,003
Net income attributable to common shareholders $ 5,991 $ 5,818 $ 6,304 $ 4,166 $ 4,977 $ 5,216 $ 6,432 $ 4,228      
Basic earnings per share attributable to common shareholders: [Abstract]                      
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 0.48 $ 0.47 $ 0.51 $ 0.34 $ 0.41 $ 0.43 $ 0.53 $ 0.35 $ 1.80 $ 1.71 $ 1.45
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 0 (0.03) 0 0 0 (0.01) (0.08)      
Basic (in dollars per share) 0.48 0.47 0.48 0.34 0.41 0.43 0.52 0.27 1.77 1.62 1.05
Diluted earnings per share attributable to common shareholders [Abstract]                      
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0.48 0.47 0.51 0.34 0.41 0.43 0.53 0.35 1.80 1.71 1.45
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 0 0 (0.03) 0 0 0 (0.01) (0.08) (0.03) (0.09) 0
Diluted (in dollars per share) $ 0.48 $ 0.47 $ 0.48 $ 0.34 $ 0.41 $ 0.43 $ 0.52 $ 0.27 $ 1.77 $ 1.62 $ 1.05
Shares used in computation [Abstract]                      
Basic (in shares) 12,421 12,421 12,409 12,313 12,267 12,244 12,224 12,129 12,392 12,217 12,063
Diluted (in shares) 12,421 12,421 12,409 12,313 12,271 12,247 12,226 12,144 12,392 12,221 12,082