Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Detail)

v2.4.0.6
Long-Term Debt - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2011
Term loan portion [Member]
Jul. 21, 2006
Term loan portion [Member]
Sep. 30, 2007
Revolving credit facility [Member]
Mar. 31, 2011
Revolving credit facility [Member]
Sep. 12, 2007
Revolving credit facility [Member]
Jul. 21, 2006
Revolving credit facility [Member]
Dec. 31, 2012
Term loan [Member]
Jul. 26, 2012
Term loan [Member]
Dec. 31, 2012
Secured Debt [Member]
Dec. 31, 2011
Secured Debt [Member]
Dec. 31, 2011
Prior Credit Facility [Member]
Jul. 21, 2006
Prior Credit Facility [Member]
Mar. 31, 2011
New Credit Facility [Member]
Dec. 31, 2012
New Credit Facility [Member]
Dec. 31, 2011
New Credit Facility [Member]
Mar. 09, 2011
New Credit Facility [Member]
Dec. 31, 2012
New Credit Facility [Member]
Revolving credit facility [Member]
Dec. 31, 2012
New Credit Facility [Member]
Term loan [Member]
Dec. 31, 2012
Maximum [Member]
Term loan [Member]
Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
Dec. 31, 2012
Minimum [Member]
Term loan [Member]
Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
Debt Instrument [Line Items]                                                    
Senior secured revolving credit facility           $ 200,000,000     $ 250,000,000 $ 100,000,000   $ 500,000,000       $ 300,000,000       $ 700,000,000            
Increase in maximum aggregate borrowing capacity             150,000,000                                      
Margin portion of interest rate in addition to LIBOR rate         1.50%     1.25%                                    
Margin portion of interest rate in addition to base rate         0.50%     0.25%                             1.50% 1.50% 0.50% 0.50%
Credit facility maturity   5 years                                                
New Credit Facility, maturity date                                   Mar. 09, 2016                
Margin portion of interest rate in addition to LIBOR rate                                             2.50% 2.50% 1.50% 1.50%
Line of credit facility, unused capacity, commitment fee percentage                                               0.50%   0.25%
Additional interest rate to LIBOR                                   1.00%                
Additional interest rate to federal funds rate                                   0.50%                
Repayment of all amounts outstanding under the prior credit facility by using borrowings under the new credit facility 500,000,000                               196,000,000                  
Debt issuance costs in connection with term loan   5,700,000                 4,500,000                              
Long-term debt, weighted average interest rate                         1.96% 1.89%                        
Borrowings under Long-term Lines of Credit   1,428,000,000   427,000,000                     54,000,000       859,700,000              
Credit facility amount paid   1,142,500,000   487,000,000                     228,900,000       657,700,000              
Amount outstanding   487,500,000 202,000,000                             487,500,000 202,000,000   0 487,500,000        
Foreign currency borrowings outstanding                                   0 0              
Aggregate annual maturities, 2013   56,300,000                                                
Aggregate annual maturities, 2014   81,200,000                                                
Aggregate annual maturities, 2015   100,000,000                                                
Aggregate annual maturities, 2016   250,000,000                                                
Interest expense   16,700,000 9,900,000 9,700,000                                            
Write-off of unamortized deferred financing costs resulting from the extinguishment of the prior senior secured facility     $ 914,000