Components of Rental Property Reorganization Charges (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Schedule of Accrued Liabilities [Line Items]
Accrued Balance	$ 1,626
Accrual	0
Payments	(1,536)
Accrued Balance	90
2013 lease abandonment costs
Schedule of Accrued Liabilities [Line Items]
Accrued Balance	1,258
Accrual	0
Payments	(1,168)
Accrued Balance	90
2009 lease abandonment costs
Schedule of Accrued Liabilities [Line Items]
Accrued Balance	368
Accrual	0
Payments	$ (368)

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 4

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant