Goodwill and Intangibles - Schedule of Changes in Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]
Balance as of December 31, 2012	$ 62,042
Additions	2,106
Amortization	(949)
Balance as of September 30, 2013	63,199
Trade Name [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Balance as of December 31, 2012	51,408
Additions	1,177
Amortization	(569)
Balance as of September 30, 2013	52,016
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Balance as of December 31, 2012	534
Additions	331
Amortization	(380)
Balance as of September 30, 2013	485
Certificate of need/license [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Balance as of December 31, 2012	10,100
Additions	598
Balance as of September 30, 2013	$ 10,698