Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Level II [Member]	Dec. 31, 2013 Level II [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value transfers between Levels	$ 0
Severance pay assets		$ 4,400,000	$ 4,100,000