Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 31, 2011
Income Tax Disclosure [Line Items]
Tax Reassessment Cash Liability				$ 15.7
Benefit over effective income tax rate	15.2	15.2	15.2
Unrecognized Tax Benefits	$ 16.8
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%