Investments in Unconsolidated Investees (Tables)

6 Months Ended

Jun. 30, 2013

Alliance-HNI, LLC and Subsidiaries [Member]

Schedule Of Equity Method Investments [Line Items]

Schedule of financial data of unconsolidated investees, Balance Sheet Data

	December 31, 2012		June 30, 2013
Balance Sheet Data:
Current assets	$	5,246	$	4,763
Noncurrent assets	10,142		9,740
Current liabilities	3,026		2,312
Noncurrent liabilities	2,669		2,072

Schedule of financial data of unconsolidated investees, Combined Operating Results

	Quarter Ended June 30,				Six Months Ended June 30,
	2012		2013		2012		2013
Operating Results:
Revenues	$	4,243	$	4,583	$	8,578	$	9,081
Expenses	2,460		2,341		4,999		4,318
Net income	1,783		2,242		3,579		4,763
Earnings from unconsolidated investee	893		1,106		1,791		2,382

Austin Cyberknife, Llc [Member]

Schedule Of Equity Method Investments [Line Items]

Schedule of financial data of unconsolidated investees, Balance Sheet Data

	December 31, 2012		June 30, 2013
Balance Sheet Data:
Current assets	$	2,150	$	1,600
Noncurrent assets	1,819		1,539
Current liabilities	732		594
Noncurrent liabilities	1,067		834

Schedule of financial data of unconsolidated investees, Combined Operating Results

	Quarter Ended June 30,				Six Months Ended June 30,
	2012		2013		2012		2013
Operating Results:
Revenues	$	2,056	$	2,376	$	3,471	$	4,245
Expenses	718		785		1,382		1,504
Net income	1,338		1,591		2,089		2,741
Earnings from unconsolidated investee	200		239		313		412

Unconsolidated Investees, Including Alliance-HNI, LLC and Subsidiaries and Austin Cyberknife [Member]

Schedule Of Equity Method Investments [Line Items]

Schedule of financial data of unconsolidated investees, Balance Sheet Data

	December 31, 2012		June 30, 2013
Balance Sheet Data:
Current assets	$	7,843	$	6,814
Noncurrent assets	12,092		11,370
Current liabilities	3,828		2,981
Noncurrent liabilities	3,736		2,910

Schedule of financial data of unconsolidated investees, Combined Operating Results

	Quarter Ended June 30,				Six Months Ended June 30,
	2012		2013		2012		2013
Combined Operating Results:
Revenues	$	7,488	$	7,272	$	14,458	$	14,009
Expenses	4,475		3,315		8,992		6,906
Net income	3,013		3,957		5,466		7,103
Earnings from unconsolidated investees	1,162		1,409		2,240		2,951