Income Taxes - Summary of Effective Income Tax Rate (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Statutory provision rate	35.00%	35.00%	35.00%	35.00%
Permanent differences and other items
State tax provision	(5.40%)	4.00%	19.20%	1.20%
Section 199 manufacturing credit	5.00%	(1.70%)	(16.40%)	(0.50%)
Return to provision adjustments / Uncertain tax positions	0.60%	3.10%	(2.50%)	(69.00%)
Non-deductible non-cash compensation	(92.00%)	(36.20%)	169.10%	838.20%
Other	(1.30%)	0.40%	(2.00%)	(9.00%)
Effective income tax rate	(58.10%)	4.60%	206.40%	795.90%