Other Non-Current Assets - Schedule of Other Non-Current Assets (Parenthetical) (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2014 Arrangement for Robotic Radio Surgery System [Member] USD ($)	Dec. 31, 2014 Arrangement for Robotic Radio Surgery System [Member] CNY	Jun. 21, 2011 Arrangement for Robotic Radio Surgery System [Member] CNY
Schedule Of Long Term Prepayment Deposits And Other Assets [Line Items]
Deposits - long-term	$ 3,133us-gaap_SecurityDeposit	19,442us-gaap_SecurityDeposit	62,139us-gaap_SecurityDeposit	$ 2,957	18,346	23,608
Security deposits non-current				$ 2,361	14,647

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant