Commitments and Contingencies - Activity With Respect to Claims and Contingencies (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period	$ 15,006	$ 129,515	$ 15,574	$ 125,880
Claims and contingencies, Balance at end of period	13,995	126,074	13,995	126,074
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period			15,574
Additional accruals	6,037	7,449	11,554	16,213
Payments, net	(7,048)	(9,301)	(13,133)	(13,272)
Claims and contingencies, Balance at end of period	13,995	12,597	13,995	12,597
CUSO RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period			0
Payments, net	0	(1,589)	0	(2,747)
Claims and contingencies, Balance at end of period	$ 0	$ 113,477	$ 0	$ 113,477