Discontinued Operations - Additional information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring Charges					$ 26,700
Goodwill Written Off Related To Business Unit To Be Disposed				$ (186,511)
Segment, Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Goodwill Written Off Related To Business Unit To Be Disposed	$ 0	$ 186,511	$ 0	186,511
Liabilities Of Disposal Group Including Discontinued Operation	1,754		1,754		5,064
Assets Of Disposal Group Including Discontinued Operation	0		0		$ 0
Segment, Continuing Operations [Member] | Restructuring Charges Member
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring Charges	$ 6,174	$ 4,574	16,927	$ 4,574
Estimate Of Restructuring Charges To Be Incurred			$ 3,200