Composition of Corporate and Unallocated Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Cost of sales	$ 160,161	$ 174,435	$ 310,637	$ 360,461
Cost of sales
Segment Reporting Information [Line Items]
Cost of sales	21,461	41,277	43,544	88,665
Selling, general, and administrative expenses
Segment Reporting Information [Line Items]
Cost of sales	95,835	88,598	182,860	183,971
Research and development expenses
Segment Reporting Information [Line Items]
Cost of sales	$ 42,865	$ 44,560	$ 84,233	$ 87,825