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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net patient revenues from continuing operations | $ 67,256 | $ 64,368 | $ 65,227 | $ 61,432 | $ 61,052 | $ 60,719 | $ 61,963 | $ 60,366 | $ 258,283 | $ 244,100 | $ 225,804
Net revenues from continuing operations | 68,605 | 65,829 | 66,868 | 62,756 | 62,381 | 62,102 | 63,397 | 61,771 | 264,058 | 249,651 | 231,523
Operating income from continuing operations | 9,372 | 9,904 | 11,059 | 8,435 | 8,301 | 9,534 | 10,806 | 9,765 | 38,770 | 38,406 | 31,428
Net income from continuing operations including noncontrolling interests | 5,796 | 6,756 | 7,642 | 5,809 | 6,032 | 6,423 | 7,452 | 6,733 | 26,003 | 26,640 | 26,679
Net income from continuing operations attributable to common shareholders | 3,903 | 4,659 | 5,079 | 3,851 | 4,230 | 4,588 | 4,958 | 4,436 | 17,492 | 18,212 | 18,812
Net losses (income) from discontinued operations attributable to common shareholders | (42) | (4,432) | (165) | (130) | (187) | (25) | (109) | 42 | (4,769) | (279) | 2,162
Net income attributable to common shareholders | $ 3,861 | $ 227 | $ 4,914 | $ 3,721 | $ 4,043 | $ 4,563 | $ 4,849 | $ 4,478 | $ 12,723 | $ 17,933 | $ 20,974
Basic earnings per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
From continuing operations. | $ 0.32 | $ 0.38 | $ 0.42 | $ 0.32 | $ 0.35 | $ 0.39 | $ 0.41 | $ 0.37 | $ 1.45 | $ 1.54 | $ 1.60
From discontinued operations |  | $ (0.36) | $ (0.01) | $ (0.01) | $ (0.02) |  | $ (0.01) |  | $ (0.40) | $ (0.02) | $ 0.18
Basic | $ 0.32 | $ 0.02 | $ 0.41 | $ 0.31 | $ 0.33 | $ 0.39 | $ 0.40 | $ 0.37 | $ 1.05 | $ 1.52 | $ 1.78
Diluted earnings per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
From continuing operations. | $ 0.32 | $ 0.38 | $ 0.42 | $ 0.32 | $ 0.35 | $ 0.38 | $ 0.41 | $ 0.37 | $ 1.45 | $ 1.53 | $ 1.57
From discontinued operations |  | $ (0.36) | $ (0.01) | $ (0.01) | $ (0.02) |  | $ (0.01) |  | $ (0.40) | $ (0.02) | $ 0.18
Diluted | $ 0.32 | $ 0.02 | $ 0.41 | $ 0.31 | $ 0.33 | $ 0.38 | $ 0.40 | $ 0.37 | $ 1.05 | $ 1.51 | $ 1.75
Shares used in computation: |  |  |  |  |  |  |  |  |  |  |
Basic | 12,103 | 12,106 | 12,089 | 11,955 | 12,103 | 12,106 | 12,089 | 11,955 | 12,063 | 11,804 | 11,814
Diluted | 12,117 | 12,120 | 12,110 | 11,979 | 12,117 | 12,120 | 12,110 | 11,979 | 12,082 | 11,904 | 11,977

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