Revenue Recognition and Accounts Receivable - Summary Information for Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Receivables [Abstract]
Accounts receivable (net of contractual allowances)	$ 7,010		$ 7,157
Less allowance for doubtful accounts	(710)	$ (732)	(991)	$ (3,455)	$ (4,487)	$ (5,347)
Patient accounts receivable - net	$ 6,300		$ 6,166