Property and Business Interruption Insurance Claims and Recoveries - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jan. 31, 2014 Cherokee Facility [Member]	Jun. 30, 2013 Cherokee Facility [Member] Cost of sales [Member]	Mar. 31, 2013 Cherokee Facility [Member] Cost of sales [Member]	Jan. 31, 2014 Cherokee Facility [Member] Property Insurance [Member]	Jun. 30, 2014 Cherokee Facility [Member] Property Insurance [Member]	Mar. 31, 2013 Cherokee Facility [Member] Business Interruption Insurance [Member]	Jun. 30, 2014 Cherokee Facility [Member] Business Interruption Insurance [Member]	Jun. 30, 2013 Cherokee Facility [Member] Business Interruption Insurance [Member]	Dec. 31, 2013 Cherokee Facility [Member] Business Interruption Insurance [Member]	Jan. 31, 2014 Cherokee Facility [Member] Business Interruption Insurance [Member] Cost of sales [Member]	Jun. 30, 2013 Cherokee Facility [Member] Business Interruption Insurance [Member] Cost of sales [Member]
Property And Or Business Interruption Insurance Claims [Line Items]
Deductible property damage under insurance						$ 2,500,000
Waiting period for business interruption coverage								30 days
Insurance claim recoverable costs			2,900,000	10,100,000		1,900,000						13,000,000
Insurance recoveries in excess of recoverable costs not recognized									2,000,000
Approved insurance payments		43,500,000			7,000,000						21,500,000
Approved insurance payments received		28,500,000
Approved insurance payments received prior to conclusion							15,000,000
Property insurance recoveries in excess of losses incurred	5,147,000					5,100,000
Deferred gain on insurance recovery										$ 1,400,000