Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Nonrecurring - Significant Unobservable Inputs (Level 3) - Ninety Nine Healthcare Management Limited Liability Company	May 11, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets acquired	$ 6,894,000
Liabilities assumed	$ 1,178,000