Components of Lease Exit Activity Recorded in Current Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Facility Lease Exit Disclosure [Line Items]
Amounts accrued					$ 4,981
Lease exit costs
Facility Lease Exit Disclosure [Line Items]
Lease exit expense incurred	$ 1,900	$ 15,200	$ 15,200	$ 500	17,142
Accretion Expense incurred				224	974
Amounts paid				(5,477)	(5,313)
Amounts offset against tenant receivable					(7,822)
Amounts accrued					$ 4,981
Additional expense incurred				$ 272