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Long-term Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]    
Unrealized losses on interest rate swap and cap agreements $ (5,469,000) $ (5,760,000)
Weighted average effective interest rate 4.40%  
Weighted average effective interest rate 4.40%  
HealthCare Partners (HCP)    
Debt Instrument [Line Items]    
Outstanding letters of credit $ 1,286,000  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Undrawn revolving credit facilities 1,000,000,000  
Letter of Credit    
Debt Instrument [Line Items]    
Outstanding letters of credit $ 91,178,000  
Interest Rate Cap Agreements Effective June 29, 2018    
Debt Instrument [Line Items]    
Derivative, expiration date Jun. 30, 2020  
Interest rate agreements, notional amount $ 3,500,000,000  
Derivative, effective date Jun. 29, 2018  
Fair value of assets $ 6,545,000  
Unrealized losses on interest rate swap and cap agreements $ (7,270,000)  
Interest Rate Cap Agreements Effective September 30, 2016    
Debt Instrument [Line Items]    
Derivative, expiration date Jun. 30, 2018  
Interest rate agreements, notional amount $ 3,500,000,000  
Derivative, effective date Sep. 30, 2016  
Fair value of assets $ 323,000  
Unrealized losses on interest rate swap and cap agreements (989,000)  
Not Designated as Hedging Instrument | Interest rate swap agreements    
Debt Instrument [Line Items]    
Notional amount $ 188,125,000  
Debt instrument, variable interest rate margin 1.75%  
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective June 29, 2018    
Debt Instrument [Line Items]    
LIBOR cap rate 3.50%  
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective September 30, 2016    
Debt Instrument [Line Items]    
LIBOR cap rate 3.50%  
Term Loan A    
Debt Instrument [Line Items]    
Debt instrument, annual principal payment $ 12,500,000  
Term Loan A | Interest rate swap agreements    
Debt Instrument [Line Items]    
Notional amount $ 724,375,000  
Weighted average effective interest rate 2.26%  
Debt instrument, variable interest rate margin 1.75%  
Derivative, expiration date Sep. 30, 2016  
Debt expense recognized $ 151,000  
Amount of gains (losses) recognized in OCI on swaps arising during the period net of tax (692,000)  
Unrealized pre-tax losses in other comprehensive income (25,000)  
Fair value of liability $ 25,000  
Term Loan A | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Debt instrument, variable interest rate margin 1.75%  
Term Loan A | London Interbank Offered Rate (LIBOR) | Interest rate swap agreements    
Debt Instrument [Line Items]    
Fixed interest rate, lower limit 0.49%  
Fixed interest rate, upper limit 0.52%  
Term Loan B    
Debt Instrument [Line Items]    
Debt instrument, annual principal payment $ 8,750,000  
Term Loan B | Interest rate cap agreements    
Debt Instrument [Line Items]    
Derivative, expiration date Sep. 30, 2016  
Debt expense recognized $ 610,000  
Interest rate agreements, notional amount $ 2,735,000,000  
Term Loan B | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Debt instrument, variable interest rate margin 2.75%  
LIBOR cap rate 2.50%  
Senior Secured Credit Facilities    
Debt Instrument [Line Items]    
Weighted average effective interest rate 3.46%