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Long-Term Debt - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jun. 12, 2008
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
JPM Term Loan [Member]
Jan. 09, 2012
Sun Trust Term Loan [Member]
Dec. 31, 2013
Sun Trust Term Loan [Member]
Jan. 09, 2012
JPM Bridge Facility [Member]
Jan. 09, 2012
JPMorgan Chase Bank, N.A. [Member]
Jan. 09, 2012
Sun Trust Revolver [Member]
Dec. 31, 2013
Sun Trust Revolver [Member]
Dec. 31, 2013
Wells Fargo Revolver [Member]
Jun. 30, 2013
Wells Fargo Revolver [Member]
Beecher Acquisition [Member]
Dec. 31, 2013
Bank Of America Loan Term Loan [Member]
Jun. 30, 2013
Bank Of America Loan Term Loan [Member]
Beecher Acquisition [Member]
Dec. 31, 2013
Private Placement [Member]
Dec. 31, 2012
Private Placement [Member]
Dec. 31, 2013
Private Placement [Member]
Series A [Member]
Dec. 31, 2013
Private Placement [Member]
Series B [Member]
Dec. 31, 2013
Private Placement [Member]
Senior Notes[Member]
Jun. 12, 2008
Line of Credit [Member]
Dec. 31, 2013
Line of Credit [Member]
Dec. 31, 2013
Line of Credit [Member]
Sun Trust Revolver [Member]
Dec. 31, 2013
Line of Credit [Member]
Wells Fargo Revolver [Member]
Dec. 31, 2013
Line of Credit [Member]
Bank Of America Loan Term Loan [Member]
Dec. 31, 2013
Master Agreement [Member]
Dec. 31, 2012
Master Agreement [Member]
Dec. 31, 2013
Master Agreement [Member]
Series C [Member]
Dec. 31, 2013
Master Agreement [Member]
Series D [Member]
Dec. 31, 2013
Master Agreement [Member]
Series E [Member]
Oct. 12, 2012
New Master Agreement [Member]
Dec. 31, 2013
New Master Agreement [Member]
Dec. 31, 2013
Minimum [Member]
LIBOR [Member]
Dec. 31, 2013
Maximum [Member]
LIBOR [Member]
Debt Instrument [Line Items]                                                                    
Unsecured senior notes outstanding   $ 480,000,000 $ 450,000,000                         $ 100,000,000 $ 100,000,000 $ 100,000,000 $ 100,000,000 $ 200,000,000           $ 150,000,000 $ 150,000,000 $ 25,000,000 $ 25,000,000 $ 100,000,000   $ 0    
Debt instrument, issuance date                                   Sep. 15, 2004 Jul. 15, 2004                 Dec. 22, 2006 Feb. 01, 2008 Sep. 15, 2011        
Debt instrument interest rate stated percentage                                   5.57% 6.08%                 5.66% 5.37% 4.50%        
Debt instrument, maturity date                       Dec. 31, 2016   Dec. 31, 2016       Sep. 15, 2011 Jul. 15, 2014       Dec. 31, 2016         Dec. 22, 2016 Jan. 15, 2015 Sep. 15, 2018        
Notes redeemed                                   100,000,000                                
Maximum shelf facility capacity                                                   200,000,000         125,000,000      
Length of the issuance period of long-term debt (in years)                                                   3 years         3 years      
Long-term debt maturity, period length, maximum (in years)                                                   Maturity dates, not to exceed ten years           Maturity dates, not to exceed ten years    
Lending commitment amount                                         50,000,000                          
Potential maximum increase in lending commitment amount                                         100,000,000                          
Revolving credit facility in the maximum principal amount             150,000,000       100,000,000 100,000,000                 75,000,000                          
Reduction in maximum principal amount   31,863,000 100,000,000                                   20,000,000                          
Revolving credit facility, extended maturity date Jun. 03, 2013                                                                  
Revolving and term loan         100,000,000 100,000,000   50,000,000 50,000,000 50,000,000                                                
Increase in revolving credit facility                     50,000,000 50,000,000                                            
Letter of credit usage fee, minimum                                           1.00%   1.00% 1.00%                  
Letter of credit usage fee, maximum                                           1.40%   1.40% 1.40%                  
LIBOR below base rate                                           1.00%   1.00%                    
Availability fees, minimum                                           0.175%   0.175%                    
Availability fees, maximum                                           0.25%   0.25%                    
Interest rate, minimum                                           1.00%   1.00%                    
Interest rate, maximum                                           1.40%   1.40%                    
Adjusted LIBOR Rate         1.00%                                                          
Revolving line of credit                          50,000,000                                          
Revolving and term loan                           30,000,000 30,000,000                                      
Revolving credit facility remaining amount                       30,000,000                                            
Borrowings outstanding                       0   30,000,000                                        
Interest margin                                                 1.50%                  
30-day LIBOR Rate                                                                 0.16% 0.16%
30-day Adjusted LIBOR Rate                                                                 0.19% 0.19%
Interest paid   16,501,000 16,090,000 15,571,000                                                            
Maturities of long term debt 2014   100,000,000                                                                
Maturities of long term debt 2015   25,000,000                                                                
Maturities of long term debt 2016   255,000,000                                                                
Maturities of long term debt 2017   0                                                                
Maturities of long term debt 2018 and beyond   $ 100,000,000