Impairment of Long-Lived Assets - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)	Mar. 31, 2016
Indefinite-lived Intangible Assets [Line Items]
Estimated aggregate fair value of long-lived assets impaired during current period	$ 1,128
Multiple of cash flows used to estimate fair value of long-lived asset	6.5	6.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration