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Long-Term Debt - Additional Information (Detail) (USD $)
6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Apr. 17, 2014
Apr. 16, 2014
Dec. 31, 2013
May 20, 2014
Agreement [Member]
Jun. 30, 2014
Credit Agreement [Member]
Apr. 17, 2014
Credit Agreement [Member]
Jan. 09, 2012
Sun Trust Term Loan [Member]
Jun. 30, 2014
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]
Jun. 30, 2014
Sun Trust Revolver [Member]
Jun. 30, 2014
JPM Term Loan [Member]
Jun. 30, 2014
Wells Fargo Revolver [Member]
Dec. 31, 2013
Wells Fargo Revolver [Member]
Jun. 30, 2013
Wells Fargo Revolver [Member]
Beecher Acquisition [Member]
Jun. 30, 2014
Bank Of America Loan Term Loan [Member]
Jun. 30, 2013
Bank Of America Loan Term Loan [Member]
Beecher Acquisition [Member]
Jun. 30, 2014
Private Placement [Member]
Series B [Member]
Dec. 31, 2013
Private Placement [Member]
Series B [Member]
Jun. 30, 2014
Private Placement [Member]
Series A [Member]
Jun. 30, 2014
Private Placement [Member]
Senior Notes[Member]
Jun. 30, 2014
Line of Credit [Member]
Jun. 30, 2014
Line of Credit [Member]
Sun Trust Revolver [Member]
Jun. 30, 2014
Line of Credit [Member]
Wells Fargo Revolver [Member]
Jun. 30, 2014
Line of Credit [Member]
Bank Of America Loan Term Loan [Member]
Jun. 30, 2014
Term Loan [Member]
May 20, 2014
Term Loan [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
May 20, 2014
Revolving Credit Facility [Member]
Jun. 30, 2014
Master Agreement [Member]
Dec. 31, 2013
Master Agreement [Member]
Jun. 30, 2014
Master Agreement [Member]
Series C [Member]
Jun. 30, 2014
Master Agreement [Member]
Series D [Member]
Jun. 30, 2014
Master Agreement [Member]
Series E [Member]
Oct. 12, 2012
New Master Agreement [Member]
Jun. 30, 2014
New Master Agreement [Member]
Dec. 31, 2013
New Master Agreement [Member]
Jun. 30, 2014
LIBOR [Member]
Debt Instrument [Line Items]                                                                                
Unsecured senior notes outstanding $ 799,734,000     $ 480,000,000                               $ 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 $ 0  
Debt instrument, issuance date                                       Jul. 15, 2004   Sep. 15, 2004                       Dec. 22, 2006 Feb. 01, 2008 Sep. 15, 2011        
Debt instrument interest rate stated percentage                                       6.08%   5.57%                       5.66% 5.37% 4.50%        
Debt instrument, maturity date                 Dec. 31, 2016           Dec. 31, 2016     Dec. 31, 2016   Jul. 15, 2014   Sep. 15, 2011     Dec. 31, 2016                 Dec. 22, 2016 Jan. 15, 2015 Sep. 15, 2018        
Notes redeemed on maturity date                                           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    
Revolving and term loan               100,000,000   50,000,000 50,000,000 50,000,000   100,000,000                                                    
Increase in borrowing capacity                 50,000,000       50,000,000                                                      
Potential increased in line of credit facility   500,000,000             150,000,000       100,000,000   100,000,000                                                  
Letter of credit usage fee, minimum                                               1.00%   1.00%                            
Letter of credit usage fee, maximum                                               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% 1.00%                          
Interest rate, maximum                                               1.40%   1.40% 1.40%                          
Adjusted LIBOR Rate                           1.00%                                                    
Revolving credit facilities 375,000,000   25,000,000                           50,000,000                       550,000,000   375,000,000                  
Revolving and term loan                                     30,000,000               30,000,000                          
Revolving credit facility remaining amount                             30,000,000                                                  
Borrowings outstanding                             0 0                                                
30-day Adjusted LIBOR Rate                                                                               0.19%
Unsecured revolving credit facility   800,000,000         1,350,000,000                                                                  
Unsecured term loans   550,000,000                                                                            
Term Loan Agreement         230,000,000                                                                      
Line of credit facility interest rate above adjusted LIBOR rate                                                       1.375%   1.175%                    
Letter of credit fees 0.20%                                                                              
Debt balance outstanding           $ 925,000,000