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Long-term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Debt Instrument [Line Items]        
Unrealized losses on interest rate swap and cap agreements $ (2,616,000) $ (2,453,000) $ (8,085,000) $ (8,213,000)
Weighted average effective interest rate     4.42%  
Weighted average effective interest rate 4.43%   4.43%  
HealthCare Partners (HCP)        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 1,286,000   $ 1,286,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Undrawn revolving credit facilities 1,000,000,000   1,000,000,000  
Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding 91,062,000   $ 91,062,000  
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   $ 3,500,000,000  
Derivative, effective date     Jun. 29, 2018  
Fair value of assets 2,698,000   $ 2,698,000  
Unrealized losses on interest rate swap and cap agreements     $ (11,118,000)  
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   $ 3,500,000,000  
Derivative, effective date     Sep. 30, 2016  
Fair value of assets 55,000   $ 55,000  
Unrealized losses on interest rate swap and cap agreements     (1,256,000)  
Not Designated as Hedging Instrument | Interest rate swap agreements        
Debt Instrument [Line Items]        
Notional amount $ 211,250,000   $ 211,250,000  
Debt instrument, variable interest rate margin     2.00%  
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective June 29, 2018        
Debt Instrument [Line Items]        
LIBOR cap rate 3.50%   3.50%  
London Interbank Offered Rate (LIBOR) | Interest Rate Cap Agreements Effective September 30, 2016        
Debt Instrument [Line Items]        
LIBOR cap rate 3.50%   3.50%  
Term Loan A        
Debt Instrument [Line Items]        
Debt instrument, annual principal payment $ 25,000,000   $ 25,000,000  
Term Loan A | Interest rate swap agreements        
Debt Instrument [Line Items]        
Notional amount $ 688,750,000   $ 688,750,000  
Weighted average effective interest rate 2.51%   2.51%  
Debt instrument, variable interest rate margin     2.00%  
Derivative, expiration date     Sep. 30, 2016  
Debt expense recognized     $ 274,000  
Amount of gains (losses) recognized in OCI on swaps arising during the period net of tax     (860,000)  
Unrealized pre-tax losses in other comprehensive income     (70,000)  
Fair value of liability $ 70,000   $ 70,000  
Term Loan A | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, variable interest rate margin     2.00%  
Term Loan A | London Interbank Offered Rate (LIBOR) | Minimum | Interest rate swap agreements        
Debt Instrument [Line Items]        
Fixed interest rate, lower limit 0.49%   0.49%  
Term Loan A | London Interbank Offered Rate (LIBOR) | Maximum | Interest rate swap agreements        
Debt Instrument [Line Items]        
Fixed interest rate, lower limit 0.52%   0.52%  
Term Loan B        
Debt Instrument [Line Items]        
Debt instrument, annual principal payment $ 17,500,000   $ 17,500,000  
Term Loan B | Interest rate cap agreements        
Debt Instrument [Line Items]        
Derivative, expiration date     Sep. 30, 2016  
Debt expense recognized     $ 1,220,000  
Interest rate agreements, notional amount $ 2,735,000,000   $ 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%   2.50%  
Senior Secured Credit Facilities        
Debt Instrument [Line Items]        
Weighted average effective interest rate 3.52%   3.52%