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Share-Based and Other Deferred Compensation - Additional information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
Long Term Incentive Plan [Member]
Jun. 30, 2014
Employee Loans [Member]
Jun. 30, 2013
Employee Loans [Member]
Jun. 30, 2014
Employee Loans [Member]
Jun. 30, 2013
Employee Loans [Member]
Jun. 30, 2014
Equity Grants [Member]
Minimum [Member]
Jun. 30, 2014
Equity Grants [Member]
Maximum [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Equity Grants [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Equity Grants [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Equity Grants [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Equity Grants [Member]
Jun. 30, 2014
Deferred Cash Program [Member]
Jun. 30, 2013
Deferred Cash Program [Member]
Jun. 30, 2014
Deferred Cash Program [Member]
Jun. 30, 2013
Deferred Cash Program [Member]
Jun. 30, 2014
Acquisition Related [Member]
Jun. 30, 2013
Acquisition Related [Member]
Jun. 30, 2014
Acquisition Related [Member]
Jun. 30, 2013
Acquisition Related [Member]
Jun. 30, 2013
LP Units [Member]
Jun. 30, 2013
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Shares issued during period (in shares)                   1,830                      
Weighted average grant date fair value (in dollars per share)           $ 53.86 $ 58.67                            
Vested units (in shares)                   3,010                      
Awards forfeited (in shares)                   136                      
Deferred compensation, vesting period (in years)                           4 years              
Compensation expense related to deferred compensation programs                       $ 946 $ 838 $ 1,840 $ 1,829            
Compensation expense related to Service-based Award               24,847 20,634 47,091 41,227                    
Amortization of LP Units                                       4,813 10,423
Compensation expense related to acquisition related awards                               1,757 3,618 3,998 7,226    
Compensation expense related to deferred cash consideration                               767 1,214 1,699 2,263    
Long Term Incentive Plan Performance period (in years) 4 years                                        
Long Term Incentive Plan Payment period (in years) 2 years                                        
Requisite service period (in years)       one                                  
Maximum contractual term (in years)       five                                  
Deferred compensation arrangement compensation expense   3,003 1,672 5,650 2,839                                
Unamortized deferred compensation   $ 13,229   $ 13,229