Deferred Court Costs, Net - Schedule of Court Cost Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013 Non AACC Merger [Member]	Jun. 30, 2012 Non AACC Merger [Member]	Jun. 30, 2013 Non AACC Merger [Member]	Jun. 30, 2012 Non AACC Merger [Member]
Deferred Court Costs [Line Items]
Balance at beginning of period	$ (129,287)	$ (130,454)	$ (176,094)	$ (162,500)	$ (149,080)
Provision for court costs						(13,594)	(12,789)	(27,014)	(25,133)
Write-off of reserve after the deferral period	9,296	22,807
Balance at end of period	$ (132,780)	$ (132,780)	$ (176,094)	$ (162,500)	$ (149,080)