Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2013 Litigation Lawsuits	Sep. 30, 2012	Mar. 31, 2012 Turner [Member]	Jul. 31, 2011 Turner [Member]	Sep. 30, 2012 Turner [Member]	Dec. 31, 2011 Turner [Member]	Sep. 30, 2013 Turner [Member]	Dec. 31, 2012 Turner [Member]	May 04, 2012 Turner [Member]	Apr. 20, 2012 Turner [Member]
Loss Contingencies [Line Items]
Number of lawsuits against Company	22
Number of product litigation matters on appeal	3
Jury decision against company				$ 10,000,000
Litigation judgment						3,300,000
Jury award value			4,400,000
Jury decision against company which adjusted to award									5,500,000	5,500,000
Benefit on reversal of accrued litigation		2,200,000			2,200,000
Benefit on reversal of accrued litigation leaving a reserve					1,100,000		1,100,000	1,100,000
Amount of settlement offer	$ 800,000