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Share-Based and Other Deferred Compensation - Additional information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended
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Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member] | Sep. 30, 2013 Employee Loans [Member] | Sep. 30, 2013 Employee Loans [Member] | Sep. 30, 2013 Deferred Cash Program [Member] | Sep. 30, 2012 Deferred Cash Program [Member] | Mar. 31, 2011 Deferred Cash Program [Member] | Sep. 30, 2013 Deferred Cash Program [Member] | Sep. 30, 2012 Deferred Cash Program [Member] | Jul. 23, 2013 Long Term Incentive Plan [Member] | Sep. 30, 2013 Long Term Incentive Plan [Member] | Sep. 30, 2013 Long Term Incentive Plan [Member] | Oct. 23, 2013 Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service based awards granted (in shares) |  |  |  | 2,237,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service based awards, grant date fair value (in dollars per share) |  |  |  |  |  | $ 26.60 | $ 50.33 |  |  |  |  |  |  |  |  |  |  |
Service based awards vested (in shares) |  |  |  | 2,083,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service based awards forfeited (in shares) |  |  |  | 58,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation, vesting period (in years) |  |  |  |  |  |  |  | P1Y |  |  |  | P4Y |  |  |  |  |  |
Compensation expense related to deferred compensation program |  |  |  |  |  |  |  | $ 1,558 | $ 4,442 | $ 949 | $ 1,053 |  | $ 2,778 | $ 3,318 |  | $ 630 | $ 630 |
Compensation expense related to service-based awards | 19,496 |  | 15,654 | 60,723 | 46,353 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to amortization of LP units | 4,820 |  | 5,464 | 15,243 | 15,293 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to acquisition related awards | 1,867 |  | 4,457 | 9,093 | 15,089 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to deferred cash consideration | 1,095 |  | 2,036 | 3,359 | 6,657 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares to be granted under stock incentive plan |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Performance Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Long Term Incentive Plan Payment Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term |  |  |  |  |  |  |  | P5Y |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Recorded Liability |  |  |  |  |  |  |  | $ 10,723 | $ 10,723 |  |  |  |  |  |  |  |  |
LP Units, Transfer Restrictions Released (in LP units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,267,000
Restricted Class A Shares, Transfer Restrictions Released (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 610,000

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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