Business Segments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Settled Litigation [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount	$ (3,700,000)
Litigation settlement amount (after tax)	(2,400,000)
Settled Litigation Regarding Investments [Member]
Segment Reporting Disclosure [Line Items]
Litigation settlement amount	1,200,000
Litigation settlement amount (after tax)	$ 752,000