Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 28, 2010
Income Tax Disclosure [Abstract]
Income tax expense	$ 48,129,000	$ 4,164,000	$ 162,243,000	$ 7,636,000
Effective tax rate	39.80%	39.40%	40.00%	38.90%
Tax Separation Agreement date			Apr. 17, 2009
Income tax examination, period of letters issued to prior parent for proposed changes in specified tax years			30 days
Excise tax contested					$ 4,200,000