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Debt - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended
Mar. 11, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Feb. 10, 2012
Sep. 30, 2013
Parent Company and Domestic Subsidiaries
Sep. 30, 2013
Foreign Subsidiaries
Aug. 20, 2013
6.375% Senior Notes due in 2020
Sep. 30, 2013
6.375% Senior Notes due in 2020
Sep. 30, 2013
Minimum
Sep. 30, 2013
Maximum
Feb. 10, 2012
Revolving Credit Facility
Nov. 10, 2011
Revolving Credit Facility
Sep. 30, 2013
Revolving Credit Facility
Feb. 10, 2012
Term Credit Facility
Nov. 10, 2011
Term Credit Facility
Sep. 30, 2013
Term Credit Facility
Aug. 20, 2013
Term Credit Facility
Fourth Amendment
Sep. 30, 2013
Term Credit Facility
Fourth Amendment
Debt Instrument [Line Items]                                        
Line of credit facility amount outstanding                                   $ 464,300,000    
Unused borrowings                             250,000,000          
Credit facilities, maximum borrowing capacity                           250,000,000     500,000,000      
Credit facilities, maturity                           5 years     5 years      
Note payable under credit facility         188,000,000 370,000,000               75,000,000            
Additional borrowing under credit facility 300,000,000   119,000,000                   95,000,000     200,000,000        
Deferred debt issuance cost           12,800,000                            
Debt issuance cost, paid   16,397,000 1,094,000 11,800,000           5,300,000                   1,600,000
Debt issuance costs   9,500,000               5,900,000                   1,700,000
Senior Notes offering amount   300,000,000             300,000,000                      
Issue price percentage of senior notes of the principal amount                 100.00%                      
Percentage of interest rate on notes                 6.375%                      
Maturity date of revolving credit facility after amendment                 Aug. 15, 2020                   Aug. 20, 2018  
Borrowing under credit facility after amendment                                     $ 300,000,000  
Credit facility, interest rate description   The applicable margin for borrowings under the Revolving Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.50% to 1.50% with respect to base rate borrowings and between 1.50% and 2.50% with respect to LIBOR based borrowings. Interest is due and payable monthly. The interest rate in effect at September 30, 2013 was 2.43%.                                    
Credit facility, interest rate margin above federal fund rate   0.50%                                    
Credit facility, interest rate margin above one-month LIBOR rate   1.00%                                    
Credit facility, interest rate margin above base rate                     0.50% 1.50%                
Credit facility, interest rate margin above LIBOR rate                     1.50% 2.50%                
Credit facility, borrowing rate   2.43%                                    
Credit Facility maturity date   Aug. 20, 2018                                    
Percentage of capital stock pledged as collateral             100.00% 65.00%