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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 31, 2013
Chief Executive Officer [Member]
Jul. 31, 2013
Chief Executive Officer [Member]
Aug. 14, 2013
Company's Director [Member]
May 23, 2013
Principal Stockholder [Member]
Apr. 30, 2013
Principal Stockholder [Member]
May 23, 2013
Former Board of Directors Chairman [Member]
Dec. 31, 2013
Series M [Member]
Dec. 31, 2012
Series M [Member]
Dec. 31, 2013
Series A [Member]
Sep. 30, 2013
Series A [Member]
Jun. 30, 2013
Series A [Member]
Mar. 31, 2013
Series A [Member]
Dec. 31, 2013
Series A [Member]
Dec. 31, 2012
Series A [Member]
Equity [Line Items]                                  
Number of convertible preferred stock 0 0               77,740 0         0 0
Series A preferred stock pays a cumulative dividend                   $ 0.20   $ 0.25 $ 0.25 $ 0.25 $ 0.25    
Preferred stock aggregate dividends                   $ 9,000 $ 267,000         $ 20,000 $ 20,000
Number of preferred stock converted into common stock                   388,700 0            
Aggregate common stock shares to repurchase               4,000,000                  
Common Stock Repurchase             2,000,000 2,000,000 2,666,000                
Repurchase Price             $ 4.02 $ 4.02 $ 4.50                
Shares repurchased 7,257,000 0 0 350,000   241,933                      
Stock repurchase price         $ 7.02 $ 7.57                      
Dividend payment restrictions 100.00%                                
Received distributions from the earnings of subsidiaries 26,900,000 40,200,000 89,300,000                            
Capital contributions to subsidiaries   $ 28,600,000 $ 49,000,000