Commitments and Contingencies - Activity With Respect to Claims and Contingencies (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period	$ 15,574	$ 125,880
Claims and contingencies, Balance at end of period	15,006	129,515
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period	15,574
Additional accruals	5,517	8,764
Payments, net	(6,085)	(3,971)
Claims and contingencies, Balance at end of period	15,006	13,585
CUSO RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period	0
Payments, net	0	(1,158)
Claims and contingencies, Balance at end of period	$ 0	$ 115,930