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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