Restructuring and Spin Transaction Costs - Changes in Restructuring Liabilities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Restructuring Reserve [Roll Forward]
Accrued liabilities at the beginning of the period	$ 5,086	$ 5,213
Restructuring expense	2,476	8,672
Payments	(7,063)	(10,081)
Accrued liabilities at the end of the period	499	3,804
Non-cash charges	$ 6,300	$ 2,800