Commitments and Contingencies - Components of Recorded Liability Related to Claims and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Claims and Contingencies [Line Items]
Total	$ 15,574	$ 125,880	$ 126,978
Other current liabilities	14,976	25,893
Other liabilities	598	99,987
Total	15,574	125,880	126,978
CUSO RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Total	0	116,923
Total	0	116,923
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Total	15,574	8,957
Total	$ 15,574	$ 8,957