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Related Party Transactions - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2011
Oct. 15, 2008
Jul. 31, 2011
Dec. 31, 2012
Tall Pines Insurance Company And EWI RE Inc [Member]
Dec. 31, 2011
Tall Pines Insurance Company And EWI RE Inc [Member]
Dec. 31, 2010
Tall Pines Insurance Company And EWI RE Inc [Member]
Dec. 31, 2012
Contran Corporation [Member]
Intercorporate Services Agreements Fees [Member]
Dec. 31, 2011
Contran Corporation [Member]
Intercorporate Services Agreements Fees [Member]
Dec. 31, 2010
Contran Corporation [Member]
Intercorporate Services Agreements Fees [Member]
Dec. 31, 2012
NL [Member]
Dec. 31, 2011
NL [Member]
Dec. 31, 2012
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
Feb. 28, 2010
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
Feb. 28, 2010
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
December 31, 2014 [Member]
Dec. 31, 2012
Scenario, Forecast [Member]
2013 [Member]
Contran Corporation [Member]
Intercorporate Services Agreements Fees [Member]
May 31, 2010
Purchase of Note Receivable [Member]
NL [Member]
Dec. 31, 2012
Purchase of Note Receivable [Member]
NL [Member]
Dec. 31, 2011
Purchase of Note Receivable [Member]
NL [Member]
May 31, 2010
Revolving bank credit facility [Member]
Feb. 28, 2010
Interest Income [Member]
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
Dec. 31, 2012
Interest Income [Member]
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
Dec. 31, 2011
Interest Income [Member]
Unsecured Revolving Demand Promissory Note [Member]
NL [Member]
Related Party Transaction [Line Items]                                            
Maximum loan amount                       $ 40,000,000 $ 8,000,000                  
Interest rate on loans repayment                           0.75%       2.75%        
Loans outstanding amount                   0 0                      
Interest income on loans                                       23,000      
Maturity date                       Dec. 31, 2014         Oct. 31, 2011          
Principal amount payable on demand date                       March 31, 2014                    
Proceeds from (payment to) loan receivable 15,000,000                             15,000,000            
Subordinate notes receivable, principal amount   15,000,000                                        
Promissory note bore interest                                   LIBOR plus 2.75%        
Borrowings under Credit Agreement     5,300,000                               5,000,000      
Cash utilized for purchase of note receivable                                   10,000,000        
Related party transaction expense       $ 1,200,000 $ 1,300,000 $ 1,100,000 $ 3,700,000 $ 3,400,000 $ 3,100,000           $ 3,900,000