Schedule II - Condensed Financial Information of Registrant Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, authorized	100,000
Redeemable preferred shares, issued	2,300
Provider Preferred-2009 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	5,000	5,000
Redeemable preferred shares, issued
Redeemable preferred shares, outstanding	0	0
Institutional Preferred Shares-2010 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	300	300
Redeemable preferred shares, issued	300	300	300
Redeemable preferred shares, outstanding	300	300
Institutional Preferred Shares-2012 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	1,000	1,000
Redeemable preferred shares, issued	1,000	1,000
Redeemable preferred shares, outstanding	1,000	1,000
Institutional Preferred Shares-2013 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	1,000	1,000
Redeemable preferred shares, issued	1,000	1,000
Redeemable preferred shares, outstanding	1,000	1,000
Class A Redeemable Common Shares [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable common shares, par value
Redeemable common shares, authorized	7,500	7,500
Redeemable common shares, issued	546	565
Redeemable common shares, outstanding	546	565
Class B Redeemable Common Shares [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable common shares, par value
Redeemable common shares, authorized	100,000	100,000
Redeemable common shares, issued	7,889	100,000
Redeemable common shares, outstanding	7,889	7,770
Redeemable Preferred Stock [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, authorized	92,700	92,700
Redeemable preferred shares, issued
Parent [Member] | Provider Preferred-2009 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	5,000	5,000
Redeemable preferred shares, issued
Parent [Member] | Institutional Preferred Shares-2010 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	300	300
Redeemable preferred shares, issued	300	300
Redeemable preferred shares, outstanding	300	300
Parent [Member] | Institutional Preferred Shares-2012 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	1,000	1,000
Redeemable preferred shares, issued	1,000	1,000
Redeemable preferred shares, outstanding	1,000	1,000
Parent [Member] | Institutional Preferred Shares-2013 Series [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, cumulative dividend rate	5.00%	5.00%
Redeemable preferred shares, authorized	1,000	1,000
Redeemable preferred shares, issued	1,000	0
Redeemable preferred shares, outstanding	1,000	0
Parent [Member] | Class A Redeemable Common Shares [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable common shares, par value
Redeemable common shares, authorized	7,500	7,500
Redeemable common shares, issued	546	565
Redeemable common shares, outstanding	546	565
Parent [Member] | Class B Redeemable Common Shares [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable common shares, par value
Redeemable common shares, authorized	100,000	100,000
Redeemable common shares, issued	7,889	7,770
Redeemable common shares, outstanding	7,889	7,770
Parent [Member] | Redeemable Preferred Stock [Member]
Schedule Of Condensed Consolidating Balance Sheets [Line Items]
Redeemable preferred shares, par value
Redeemable preferred shares, authorized	93,700	93,700
Redeemable preferred shares, issued