Shareholders' Equity Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2013
Stockholders Equity Note [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.48
Repurchase and retirement of common stock		$ 244
Repurchase and retirement of common stock, shares		2,000
Shares remaining available for repurchases		1,602,000
Cash dividend paid during period, per share		$ 0.48	$ 0.42
Common stock excluded from calculation of diluted earnings per share		379,000	566,000