Inventories - Major Classes of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials	$ 92,784	$ 92,072
Work-in-process	36,182	34,391
Finished goods	109,761	110,280
Perishable tooling and supplies	2,325	2,493
Gross inventories	241,052	239,236
Obsolescence and other reserves	(21,984)	(23,954)
Net inventories	$ 219,068	$ 215,282