Commitments and Contingencies - Components of Recorded Liability Related to Claims and Contingencies (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule of Claims and Contingencies [Line Items]
Total	$ 15,006	$ 15,574	$ 129,515	$ 125,880
Other current liabilities	14,408	14,976	32,409
Other liabilities	598	598	97,106
Total	15,006	15,574	129,515	$ 125,880
CUSO RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Total	0	0	115,930
Total	0	0	115,930
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Total	15,006	15,574	13,585
Total	$ 15,006	$ 15,574	$ 13,585