Contingency - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended		1 Months Ended
	Aug. 30, 2013	Aug. 30, 2013 Baker and Collier Litigation [Member] Cases	Sep. 20, 2013 Baker and Collier Litigation [Member] Scenario, Forecast [Member]	Sep. 27, 2013 Baker and Collier Litigation [Member] Scenario, Forecast [Member]	Sep. 27, 2013 Baker and Collier Litigation [Member] Scenario, Forecast [Member] Future Settlement Payment [Member]
Litigation And Other Contingencies [Line Items]
Number of cases consolidated by court		2
Deposit into settlement fund to be distributed to members of class on Insurance Policies lawsuits			$ 12.5
Percentage of first settlement amount deposited into settlement fund				50.00%
Percentage of remaining settlement amount deposited into settlement fund					50.00%
Settlement date		September 20, 2013
Merger consideration before litigation settlement	$ 18.20
Merger consideration after litigation settlement	$ 19.00