Selected Quarterly Financial Data (Unaudited) - Restated Consolidated Statement of Net Income (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
 [1]
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]                              
Net patient revenues $ 88,946 $ 86,411 [1] $ 88,433 [1] $ 85,049 [1] $ 84,881 $ 82,154 [1] $ 81,451 [1] $ 75,807 [1] $ 173,482 [1] $ 157,258 [1] $ 259,893 [1] $ 239,412 [1] $ 348,839 $ 324,293 [1] $ 299,009 [1]
Other revenues   1,933 [1] 1,997 [1] 1,859 [1]   1,895 [1] 1,837 [1] 1,434 [1] 3,856 [1] 3,271 [1] 5,789 [1] 5,166 [1] 7,707 7,009 [1] 6,065 [1]
Net revenues 90,864 88,344 [1] 90,430 [1] 86,908 [1] 86,724 84,049 [1] 83,288 [1] 77,241 [1] 177,338 [1] 160,529 [1] 265,682 [1] 244,578 [1] 356,546 331,302 [1] 305,074 [1]
Clinic operating costs [Abstract]                              
Salaries and related costs   49,868 [1] 48,837 [1] 47,804 [1]   46,594 [1] 44,398 [1] 43,052 [1] 96,641 [1] 87,450 [1] 146,509 [1] 134,044 [1] 198,495 180,514 [1] 163,417 [1]
Rent, clinic supplies, contract labor and other   17,885 [1] 17,546 [1] 17,507 [1]   17,428 [1] 16,681 [1] 16,325 [1] 35,053 [1] 33,006 [1] 52,938 [1] 50,434 [1] 71,868 68,046 [1] 61,209 [1]
Provision for doubtful accounts   917 [1] 956 [1] 1,089 [1]   1,067 [1] 1,062 [1] 990 [1] 2,045 [1] 2,052 [1] 2,962 [1] 3,119 [1] 4,040 4,170 [1] 4,112 [1]
Closure costs   9 [1] 32 [1] 13 [1]   88 [1] 5 [1] 32 [1] 45 [1] 37 [1] 54 [1] 125 [1] 131 211 [1] 169 [1]
Total clinic operating costs   68,679 [1] 67,371 [1] 66,413 [1]   65,177 [1] 62,146 [1] 60,399 [1] 133,784 [1] 122,545 [1] 202,463 [1] 187,722 [1] 274,534 252,941 [1] 228,907 [1]
Gross margin   19,665 [1] 23,059 [1] 20,495 [1]   18,872 [1] 21,142 [1] 16,842 [1] 43,554 [1] 37,984 [1] 63,219 [1] 56,856 [1] 82,012 78,361 [1] 76,167 [1]
Corporate office costs   7,610 [1] 8,026 [1] 9,004 [1]   6,923 [1] 7,593 [1] 7,657 [1] 17,030 [1] 15,250 [1] 24,640 [1] 22,173 [1] 32,479 31,067 [1] 30,399 [1]
Operating income $ 10,954 12,055 [1] 15,033 [1] 11,491 [1] $ 12,611 11,949 [1] 13,549 [1] 9,185 [1] 26,524 [1] 22,734 [1] 38,579 [1] 34,683 [1] 49,533 47,294 [1] 45,768 [1]
Interest and other income, net   21 [1] 21 [1] 20 [1]   24 [1] 16 [1] 8 [1] 41 [1] 24 [1] 62 [1] 48 [1] 93 81 [1] 18 [1]
Interest expense [Abstract]                              
Mandatorily redeemable non-controlling interests - change in redemption value   (1,934) [1] (1,931) [1] (2,191) [1]   (501) [1] 48 [1] (244) [1] (4,122) [1] (196) [1] (6,056) [1] (697) [1] (6,169) (2,670) [1],[2] (2,978) [1],[2]
Mandatorily redeemable non-controlling interests - earnings allocable   (929) [1] (1,330) [1] (887) [1]   (778) [1] (1,190) [1] (706) [1] (2,217) [1] (1,896) [1] (3,146) [1] (2,674) [1] (4,057) (3,538) [1],[2] (3,388) [1],[2]
Debt and other   (326) [1] (320) [1] (308) [1]   (255) [1] (245) [1] (265) [1] (628) [1] (510) [1] (954) [1] (765) [1] (1,252) (1,031) [1] (1,088) [1]
Total interest expense   (3,189) [1] (3,581) [1] (3,386) [1]   (1,534) [1] (1,387) [1] (1,215) [1] (6,967) [1] (2,602) [1] (10,156) [1] (4,136) [1] (11,478) (7,239) [1] (7,454) [1]
Income before taxes   8,887 [1] 11,473 [1] 8,125 [1]   10,439 [1] 12,178 [1] 7,978 [1] 19,598 [1] 20,156 [1] 28,485 [1] 30,595 [1] 38,148 40,136 [1] 38,332 [1]
Provision for income taxes   2,753 [1] 3,802 [1] 2,172 [1]   3,465 [1] 4,221 [1] 2,685 [1] 5,974 [1] 6,906 [1] 8,727 [1] 10,371 [1] 11,880 13,647 [1] 13,018 [1]
Net income   6,134 [1] 7,671 [1] 5,953 [1]   6,974 [1] 7,957 [1] 5,293 [1] 13,624 [1] 13,250 [1] 19,758 [1] 20,224 [1] 26,268 26,489 [1] 25,314 [1]
Less: net income attributable to non-controlling interests   (1,330) [1] (1,659) [1] (1,465) [1]   (1,468) [1] (1,623) [1] (1,279) [1] (3,124) [1] (2,902) [1] (4,454) [1] (4,370) [1] (5,717) (5,874) [1] (6,183) [1]
Net income attributable to USPH shareholders   $ 4,804 [1] $ 6,012 [1] $ 4,488 [1]   $ 5,506 [1] $ 6,334 [1] $ 4,014 [1] $ 10,500 [1] $ 10,348 [1] $ 15,304 [1] $ 15,854 [1] $ 20,551 $ 20,615 [1] $ 19,131 [1]
Basic and diluted earnings per share attributable to USPH shareholders (in dollars per share) $ 0.42 $ 0.38 [1] $ 0.48 [1] $ 0.36 [1] $ 0.38 $ 0.44 [1] $ 0.51 [1] $ 0.33 [1] $ 0.84 [1] $ 0.84 [1] $ 1.22 [1] $ 1.28 [1] $ 1.64 $ 1.66 [1] $ 1.57 [1]
Shares used in computation - basic (in shares)   12,520 [1] 12,511 [1] 12,448 [1]   12,421 [1] 12,409 [1] 12,313 [1] 12,480 [1] 12,362 [1] 12,494 [1] 12,382 [1] 12,500 12,392 [1] 12,217 [1]
Shares used in computation - diluted (in shares)   12,520 [1] 12,511 [1] 12,448 [1]   12,421 [1] 12,409 [1] 12,313 [1] 12,480 [1] 12,362 [1] 12,494 [1] 12,382 [1] 12,500 12,392 [1] 12,221 [1]
Dividends declared per common share (in dollars per share)   $ 0.17 [1] $ 0.17 [1] $ 0.17 [1]   $ 0.15 [1] $ 0.15 [1] $ 0.15 [1] $ 0.34 [1] $ 0.30 [1] $ 0.51 [1] $ 0.45 [1] $ 0.68 $ 0.60 [1] $ 0.48 [1]
As Reported [Member]                              
Income Statement [Abstract]                              
Net patient revenues   $ 86,411 $ 88,433 $ 85,049   $ 82,154 $ 81,451 $ 75,807 $ 173,482 $ 157,258 $ 259,893 $ 239,412      
Other revenues   1,933 1,997 1,859   1,895 1,837 1,434 3,856 3,271 5,789 5,166      
Net revenues   88,344 90,430 86,908   84,049 83,288 77,241 177,338 160,529 265,682 244,578      
Clinic operating costs [Abstract]                              
Salaries and related costs   49,868 48,837 47,804   46,594 44,398 43,052 96,641 87,450 146,509 134,044      
Rent, clinic supplies, contract labor and other   17,885 17,546 17,507   17,428 16,681 16,325 35,053 33,006 52,938 50,434      
Provision for doubtful accounts   917 956 1,089   1,067 1,062 990 2,045 2,052 2,962 3,119      
Closure costs   9 32 13   88 5 32 45 37 54 125      
Total clinic operating costs   68,679 67,371 66,413   65,177 62,146 60,399 133,784 122,545 202,463 187,722      
Gross margin   19,665 23,059 20,495   18,872 21,142 16,842 43,554 37,984 63,219 56,856      
Corporate office costs   7,610 8,026 9,004   6,923 7,593 7,657 17,030 15,250 24,640 22,173      
Operating income   12,055 15,033 11,491   11,949 13,549 9,185 26,524 22,734 38,579 34,683      
Interest and other income, net   21 21 20   24 16 8 41 24 62 48      
Interest expense [Abstract]                              
Mandatorily redeemable non-controlling interests - change in redemption value   0 0 0   0 0 0 0 0 0 0   $ 0 [2] $ 0 [2]
Mandatorily redeemable non-controlling interests - earnings allocable   0 0 0   0 0 0 0 0 0 0   0 [2] 0 [2]
Debt and other   (326) (320) (308)   (255) (245) (265) (628) (510) (954) (765)      
Total interest expense   (326) (320) (308)   (255) (245) (265) (628) (510) (954) (765)   (1,031) (1,088)
Income before taxes   11,750 14,734 11,203   11,718 13,320 8,928 25,937 22,248 37,687 33,966   46,344 44,698
Provision for income taxes   3,778 4,674 3,523   3,654 4,203 2,777 8,197 6,980 11,975 10,634   14,653 14,274
Net income   7,972 10,060 7,680   8,064 9,117 6,151 17,740 15,268 25,712 23,332   31,691 30,424
Less: net income attributable to non-controlling interests   (2,259) (2,989) (2,352)   (2,246) (2,813) (1,985) (5,341) (4,798) (7,600) (7,044)   (9,412) (9,571)
Net income attributable to USPH shareholders   $ 5,713 $ 7,071 $ 5,328   $ 5,818 $ 6,304 $ 4,166 $ 12,399 $ 10,470 $ 18,112 $ 16,288   $ 22,279 $ 20,853
Basic and diluted earnings per share attributable to USPH shareholders (in dollars per share)   $ 0.46 $ 0.57 $ 0.43   $ 0.47 $ 0.48 $ 0.34 $ 0.99 $ 0.82 $ 1.45 $ 1.29   $ 1.77 $ 1.62
Shares used in computation - basic (in shares)   12,520 12,511 12,448   12,421 12,409 12,313 12,480 12,362 12,494 12,382      
Shares used in computation - diluted (in shares)   12,520 12,511 12,448   12,421 12,409 12,313 12,480 12,362 12,494 12,382      
Dividends declared per common share (in dollars per share)   $ 0.17 $ 0.17 $ 0.17   $ 0.15 $ 0.15 $ 0.15 $ 0.34 $ 0.30 $ 0.51 $ 0.45      
Adjustment [Member]                              
Income Statement [Abstract]                              
Net patient revenues   $ 0 $ 0 $ 0   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0      
Other revenues   0 0 0   0 0 0 0 0 0 0      
Net revenues   0 0 0   0 0 0 0 0 0 0      
Clinic operating costs [Abstract]                              
Salaries and related costs   0 0 0   0 0 0 0 0 0 0      
Rent, clinic supplies, contract labor and other   0 0 0   0 0 0 0 0 0 0      
Provision for doubtful accounts   0 0 0   0 0 0 0 0 0 0      
Closure costs   0 0 0   0 0 0 0 0 0 0      
Total clinic operating costs   0 0 0   0 0 0 0 0 0 0      
Gross margin   0 0 0   0 0 0 0 0 0 0      
Corporate office costs   0 0 0   0 0 0 0 0 0 0      
Operating income   0 0 0   0 0 0 0 0 0 0      
Interest and other income, net   0 0 0   0 0 0 0 0 0 0      
Interest expense [Abstract]                              
Mandatorily redeemable non-controlling interests - change in redemption value   (1,934) (1,931) (2,191)   (501) 48 (244) (4,122) (196) (6,056) (697)   $ (2,670) [2] $ (2,978) [2]
Mandatorily redeemable non-controlling interests - earnings allocable   (929) (1,330) (887)   (778) (1,190) (706) (2,217) (1,896) (3,146) (2,674)   (3,538) [2] (3,388) [2]
Debt and other   0 0 0   0 0 0 0 0 0 0      
Total interest expense   (2,863) (3,261) (3,078)   (1,279) (1,142) (950) (6,339) (2,092) (9,202) (3,371)   (6,208) (6,366)
Income before taxes   (2,863) (3,261) (3,078)   (1,279) (1,142) (950) (6,339) (2,092) (9,202) (3,371)   (6,208) (6,366)
Provision for income taxes   (1,025) (872) (1,351)   (189) 18 (92) (2,223) (74) (3,248) (263)   (1,006) (1,256)
Net income   (1,838) (2,389) (1,727)   (1,090) (1,160) (858) (4,116) (2,018) (5,954) (3,108)   (5,202) (5,110)
Less: net income attributable to non-controlling interests   929 1,330 887   778 1,190 706 2,217 1,896 3,146 2,674   3,538 3,388
Net income attributable to USPH shareholders   $ (909) $ (1,059) $ (840)   $ (312) $ 30 $ (152) $ (1,899) $ (122) $ (2,808) $ (434)   $ (1,664) $ (1,722)
Basic and diluted earnings per share attributable to USPH shareholders (in dollars per share)   $ (0.08) $ (0.09) $ (0.07)   $ (0.03) $ 0.03 $ (0.01) $ (0.15) $ 0.02 $ (0.23) $ (0.01)   $ (0.11) $ (0.05)
[1] as restated
[2] Mandatorily redeemable non-controlling interests