Other Expense, Net - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Other Income (Expense) [Line Items]
Impairment charge	$ 6,200,000	$ 21,200,000	$ 21,200,000	$ 15,800,000	$ 90,000,000
Carrying value of the investment	$ 0