Commitments and Contingencies - Additional Information (Detail) € in Millions, $ in Millions	Oct. 01, 2016 EUR (€) Facility	Sep. 28, 2016 USD ($) Hospital	Sep. 09, 2016 EUR (€) Hospital	Jul. 20, 2016 EUR (€) Hospital
Washington and Idaho [Member]
Commitment And Contingencies [Line Items]
Number of rehabilitation hospitals | Hospital		2
Purchase price of acquisition | $		$ 105
Germany [Member]
Commitment And Contingencies [Line Items]
Number of rehabilitation hospitals | Hospital			6	23
Purchase price of acquisition | €			€ 46.3	€ 215.7
Germany [Member] | Subsequent Event [Member]
Commitment And Contingencies [Line Items]
Number of facilities closed | Facility	3
Consideration received on closing of facilities | €	€ 22.9