Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Property and Equipment Impairment Charges (Detail)

v2.4.1.9
Property and Equipment - Property and Equipment Impairment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Continuing Operations [Member]      
Property Plant And Equipment [Line Items]      
Property and equipment impairment charges $ 4,394us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember 		$ 9,272us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember 		$ 440us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member]      
Property Plant And Equipment [Line Items]      
Property and equipment impairment charges     $ 510us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember