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Significant terms of equity contract classified as temporary equity to issue additional shares. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			3 Months Ended
	Dec. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Equity [Line Items]
Contingently redeemable common stock, issued shares	1,000,000us-gaap_TemporaryEquitySharesIssued	1,000,000us-gaap_TemporaryEquitySharesIssued	1,000,000us-gaap_TemporaryEquitySharesIssued		1,000,000us-gaap_TemporaryEquitySharesIssued
Redeemable Common Stock. price per share	$ 19.00
Redeemable Common Stock, required holding period	6 months
Redeemable Common Stock, contract terms		Ananke is required to hold the shares of common stock for a minimum of six months and then may: 1) sell up to one-third during the next three-month period, 2) sell another one-third during the next three-month period and 3) sell the remaining purchased thereafter.
Shares repurchased during period		$ 29,736,000	$ 32,366,000
Received distributions from the earnings of subsidiaries		55,800,000	26,900,000	40,200,000
Capital contributions to subsidiaries				28,600,000
Pro-Forma [Member]
Equity [Line Items]
Contingently redeemable common stock, issued shares	1,000,000
Redeemable Common Stock. price per share	$ 19.00
Redeemable Common Stock, required holding period	6 months
Redeemable Common Stock, contract terms		Ananke is required to hold the shares of common stock for a minimum of six months and then may: 1) sell up to one-third during the next three-month period, 2) sell another one-third during the next three-month period and 3) sell the remaining purchased thereafter.
Open Market [Member]
Equity [Line Items]
Treasury shares acquired		1,166,208
Shares repurchased during period		15,000,000
Company's Director [Member]
Equity [Line Items]
Treasury shares acquired			241,933
Shares repurchased during period			1,800,000
Former Board of Directors Chairman [Member]
Equity [Line Items]
Treasury shares acquired		1,225,000	7,016,000
Shares repurchased during period		14,700,000	30,500,000
Percentage of common stock owned		3.00%			3.00%
Series A [Member]
Equity [Line Items]
Series A preferred stock pays a cumulative dividend					$ 0.25	$ 0.25	$ 0.25	$ 0.25
Preferred stock aggregate dividends		13,000	20,000
Conversion of preferred shares into common stock		9,975	0
Conversion of preferred stock, shares		24,938
Series M [Member]
Equity [Line Items]
Series A preferred stock pays a cumulative dividend		$ 0.20
Preferred stock aggregate dividends		$ 400	$ 9,000
Conversion of preferred shares into common stock		8,000	77,740
Conversion of preferred stock, shares		40,000	388,700