Basis of Presentation and Significant Accounting Policies - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory Net [Abstract]
Raw materials and supplies	$ 82,485	$ 85,455
Work in progress	9,986	10,872
Finished goods	20,500	16,731
Total inventories	$ 112,971	$ 113,058