Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Funds on deposit with third parties	$ 81,276us-gaap_DepositAssets	$ 79,317us-gaap_DepositAssets
Liabilities
Contingent earn-out obligations	39,129	28,058
Fair Value, Measurements, Recurring
Assets
Available for sale securities	28,123	19,421
Funds on deposit with third parties	81,276	79,317
Liabilities
Interest rate swap agreements	1,457	12,069
Contingent earn-out obligations	39,129	28,058
Temporary equity
Noncontrolling interests subject to put provisions	829,965	697,300
Fair Value, Measurements, Recurring \| Level 1
Assets
Available for sale securities	28,123	19,421
Funds on deposit with third parties	81,276	79,317
Fair Value, Measurements, Recurring \| Level 2
Liabilities
Interest rate swap agreements	1,457	12,069
Fair Value, Measurements, Recurring \| Level 3
Liabilities
Contingent earn-out obligations	39,129	28,058
Temporary equity
Noncontrolling interests subject to put provisions	829,965	697,300
Fair Value, Measurements, Recurring \| Interest rate cap agreements
Assets
Interest rate derivative agreements	13,934	7,567
Fair Value, Measurements, Recurring \| Interest rate cap agreements \| Level 2
Assets
Interest rate derivative agreements	13,934	7,567
Fair Value, Measurements, Recurring \| Interest rate swap agreements
Assets
Interest rate derivative agreements	3,281	10,004
Fair Value, Measurements, Recurring \| Interest rate swap agreements \| Level 2
Assets
Interest rate derivative agreements	$ 3,281	$ 10,004

Fair values as of the balance sheet date of contingent earn-out considerations if certain performance targets are met.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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- Definition

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

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-Paragraph 3A

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