Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

The following table sets forth selected unaudited quarterly information for the Company’s last eight fiscal quarters derived from the Company’s interim financial statements. Such financial statements have been prepared on the same basis as the Consolidated Financial Statements and all necessary adjustments (which consisted only of normal recurring adjustments) have been included to present fairly the results of such periods when read in conjunction with the Consolidated Financial Statements and related notes included elsewhere herein.

	Quarter Ended
	Mar. 31,		Jun. 30,			Sep. 30,		Dec. 31,
	2015		2015			2015		2015
Revenues	$	109,429	$	118,504		$	120,784	$	124,337
Cost of revenues, excluding depreciation and amortization		61,886		67,485			67,057		72,676
Income before income taxes, earnings from unconsolidated    investees and noncontrolling interest		6,507		284			17,571		5,898
Net income		6,098		2,942			13,065		5,010
Net income (loss) attributable to Alliance HealthCare Services, Inc.		1,751		(1,961	)		7,204		(252	)
Income (loss) per common share attributable to Alliance    HealthCare Services, Inc.:
Basic	$	0.16	$	(0.18	)	$	0.67	$	(0.02	)
Diluted	$	0.16	$	(0.18	)	$	0.67	$	(0.02	)
	Quarter Ended
	Mar. 31,		Jun. 30,			Sep. 30,		Dec. 31,
	2014		2014			2014		2014
Revenues	$	105,365	$	111,238		$	110,137	$	109,647
Cost of revenues, excluding depreciation and amortization		56,940		59,627			59,401		61,452
Income before income taxes, earnings from unconsolidated    investees and noncontrolling interest		5,489		7,380			9,583		5,722
Net income		4,980		6,820			7,854		5,847
Net income attributable to Alliance HealthCare Services, Inc.		1,931		2,784			4,011		1,892
Income per common share attributable to Alliance HealthCare    Services, Inc.:
Basic	$	0.18	$	0.26		$	0.37	$	0.19
Diluted	$	0.18	$	0.26		$	0.37	$	0.17