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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Long Term Incentive Plan Payment Period + References No definition available. + Details
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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 maximum term of 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 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 minimum period that the individual is required to perform services in order to be fully vested under 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 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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