Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Oct. 08, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Total long-term debt		$ 159,900		$ 161,500
Repayments of Long-term Debt		$ 4,262	$ 2,249
Notes Payable, Other Payables [Member] | Subsequent Event [Member] | Shelf Notes [Member]
Debt Instrument [Line Items]
Period To Purchase Unsecured Senior Notes	3 years
Maturity Date For Unsecured Senior Notes	20 years
Scenario, Forecast [Member] | Notes Payable, Other Payables [Member] | Subsequent Event [Member] | Shelf Notes [Member]
Debt Instrument [Line Items]
Senior Notes	$ 150,000