Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Variable Interest Entities - Guarantee and Other Payments Related to PEAKS Program (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
PEAKS Guarantee			$ 30,090
PEAKS Program [Member]
Variable Interest Entity [Line Items]
PEAKS Guarantee	$ 4,534	$ 13,637