Loans Payable - Amounts Outstanding and Accrued Interest (Detail) - USD ($) $ in Thousands		6 Months Ended
	Dec. 24, 2014	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term bank debt		$ 613,298	$ 599,750
Accrued interest		732	500
Total loans payable		$ 614,030	600,250
Line of Credit | EGL Revolving Credit Facility
Debt Instrument [Line Items]
Term		5 years
Total long-term bank debt		$ 549,798	505,750
Line of Credit | Sussex Facility
Debt Instrument [Line Items]
Term	4 years	4 years
Total long-term bank debt		$ 63,500	$ 94,000
Total loans payable		$ 63,500