Business Segment Information - Schedule of Net Sales by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 108,545	$ 133,072	$ 152,747	$ 153,293	$ 132,894	$ 140,973	$ 155,955	$ 134,163	$ 547,657	$ 563,985	$ 450,745
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									542,000	559,510	446,972
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,075	3,669	2,982
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 582	$ 806	$ 791