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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% |

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