Material Transactions Affecting Stockholders' Equity (Detail) (USD $)	3 Months Ended		12 Months Ended				27 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008	Mar. 31, 2013
Equity [Abstract]
Preferred Stock, Shares Issued (in Shares)	0		0	0		193,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)						1,305,230
Stock Repurchased and Retired During Period, Value				$ 193,000,000.0	$ 193,000,000	$ 193,000,000.0
Debt Instrument, Face Amount					115,000,000
Adjustments to Additional Paid in Capital, Other					900,000
Dividends, Preferred Stock, Cash			$ 0	$ 0	$ 8,658,000
Common Stock, Dividends, Per Share, Declared (in Dollars per share)	$ 0.070	$ 0.040	$ 0.16	$ 0.04	$ 0.04		$ 0.01