Commitments and Contingencies - Components of Recorded Liability Related to Claims and Contingencies (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule of Claims and Contingencies [Line Items]
Total	$ 13,995	$ 15,006	$ 15,574	$ 126,074	$ 129,515	$ 125,880
Other current liabilities	13,397		14,976	32,169
Other liabilities	598		598	93,905
Total	13,995	$ 15,006	15,574	126,074	$ 129,515	$ 125,880
CUSO RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Total	0		0	113,477
Total	0		0	113,477
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Total	13,995		15,574	12,597
Total	$ 13,995		$ 15,574	$ 12,597