Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	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
Income Statement [Abstract]
Revenue before provision for doubtful accounts	$ 189,999	$ 184,702	$ 177,494	$ 161,213	$ 114,252	$ 103,116	$ 100,530	$ 89,563	$ 735,109	$ 413,850	$ 219,704
Provision for doubtful accounts									(21,701)	(6,389)	(3,206)
Revenue									713,408	407,461	216,498
Salaries, wages and benefits (including equity-based compensation expense of $5,249, $2,267 and $17,320, respectively)									407,962	239,639	152,609
Professional fees									37,171	19,019	8,896
Supplies									37,569	19,496	11,349
Rents and leases									10,049	7,838	5,576
Other operating expenses									80,572	42,777	20,171
Depreciation and amortization									17,090	7,982	4,278
Interest expense, net									37,250	29,769	9,191
Debt extinguishment costs				(9,500)					9,350
Sponsor management fees											1,347
Transaction-related expenses									7,150	8,112	41,547
Total expenses									644,163	374,632	254,964
Income (loss) from continuing operations before income taxes	19,935	22,287	20,291	6,732	7,506	10,311	10,020	4,992	69,245	32,829	(38,466)
Provision for (benefit from) income taxes									25,975	12,325	(5,272)
Income (loss) from continuing operations									43,270	20,504	(33,194)
Loss from discontinued operations, net of income taxes									(691)	(101)	(1,698)
Net income (loss)	$ 12,280	$ 14,364	$ 12,197	$ 3,738	$ 4,365	$ 6,450	$ 5,909	$ 3,679	$ 42,579	$ 20,403	$ (34,892)
Basic earnings (loss) per share:
Income (loss) from continuing operations									$ 0.87	$ 0.53	$ (1.77)
Loss from discontinued operations									$ (0.02)		$ (0.09)
Net income (loss)	$ 0.25	$ 0.29	$ 0.24	$ 0.07					$ 0.85	$ 0.53	$ (1.86)
Diluted earnings (loss) per share:
Income (loss) from continuing operations									$ 0.86	$ 0.53	$ (1.77)
Loss from discontinued operations									$ (0.01)		$ (0.09)
Net income (loss)	$ 0.24	$ 0.29	$ 0.24	$ 0.07					$ 0.85	$ 0.53	$ (1.86)
Weighted-average shares outstanding:
Basic									50,004	38,477	18,757
Diluted									50,261	38,696	18,757