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Financial Instruments Measured At Fair Value, on Recurring Basis (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Realized and Unrealized Gains and Losses on Available For Sales Securities | $ 0 | $ 0 | $ 0 | $ 0 |
Maximum payout for contingent obligation | 35,500,000 |  | 35,500,000 |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 100,000 |  | 0 |  |
Financial instruments measured at fair value, on a recurring basis |  |  |  |  |
Interest rate caps | (35,500,000) |  | (35,500,000) |  | $ 0
Fair Value, Recurring |  |  |  |  |
Financial instruments measured at fair value, on a recurring basis |  |  |  |  |
Trading securities | 11,800,000 |  | 11,800,000 |  |
Available for sale securities | 2,900,000 |  | 2,900,000 |  |
Assets, Fair Value Disclosure | 14,700,000 |  | 14,700,000 |  |
Interest rate caps | (35,500,000) |  | (35,500,000) |  |
Contingent obligations | (7,900,000) |  | (7,900,000) |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (43,400,000) |  | (43,400,000) |  |
Level 1 | Fair Value, Recurring |  |  |  |  |
Financial instruments measured at fair value, on a recurring basis |  |  |  |  |
Trading securities | 7,600,000 |  | 7,600,000 |  |
Available for sale securities | 0 |  | 0 |  |
Assets, Fair Value Disclosure | 7,600,000 |  | 7,600,000 |  |
Interest rate caps | 0 |  | 0 |  |
Contingent obligations | 0 |  | 0 |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |  | 0 |  |
Level 2 | Fair Value, Recurring |  |  |  |  |
Financial instruments measured at fair value, on a recurring basis |  |  |  |  |
Trading securities | 4,200,000 |  | 4,200,000 |  |
Available for sale securities | 2,900,000 |  | 2,900,000 |  |
Assets, Fair Value Disclosure | 7,100,000 |  | 7,100,000 |  |
Interest rate caps | (35,500,000) |  | (35,500,000) |  |
Contingent obligations | 0 |  | 0 |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (35,500,000) |  | (35,500,000) |  |
Level 3 | Fair Value, Recurring |  |  |  |  |
Financial instruments measured at fair value, on a recurring basis |  |  |  |  |
Trading securities | 0 |  | 0 |  |
Available for sale securities | 0 |  | 0 |  |
Assets, Fair Value Disclosure | 0 |  | 0 |  |
Interest rate caps | 0 |  | 0 |  |
Contingent obligations | (7,900,000) |  | (7,900,000) |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ (7,900,000) |  | $ (7,900,000) |  |
Minimum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Dec. 17, 2027 |  |  |  |
Maximum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Date | Jan. 17, 2033 |  |  |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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