Commitments and Contingencies - Exit and Disposal Activity and Liability Balances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Lease Termination Costs
Commitments And Contingencies [Line Items]
Beginning Balance	$ 1,425	$ 707
Payments	(176)	(707)
Adjustments	47
Ending Balance	1,296
Other Exit Costs
Commitments And Contingencies [Line Items]
Beginning Balance	204
Adjustments	(69)
Ending Balance	135
Lease Termination Costs and Other Exit Costs
Commitments And Contingencies [Line Items]
Beginning Balance	1,629	707
Payments	(176)	$ (707)
Adjustments	(22)
Ending Balance	$ 1,431