Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail) - USD ($)							6 Months Ended		12 Months Ended
	Jun. 21, 2016	May 26, 2016	May 16, 2016	Mar. 03, 2016	Feb. 22, 2016	Mar. 03, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Aug. 01, 2016
Basis Of Presentation [Line Items]
Sale of disposal group						$ 275,000,000
Per common share quarterly dividend		$ 0.225		$ 0.225
Total dividend paid to shareholders			$ 18,600,000		$ 18,800,000
Dividends Payable, Date of Record		May 16, 2016		Feb. 22, 2016			Aug. 22, 2016
Dividends Payable, Date to be Paid							Sep. 01, 2016
Share repurchase program, authorized amount							$ 75,000,000
Number of common stock shares purchased							1,000,000
Aggregate share purchase price							$ 22,000,000
Proceeds from the sale of property and equipment							$ 38,368,000	$ 0
Gain loss on disposition of assets and leaseback transaction	$ 19,000,000
leaseback agreement period							P12Y
Deferred gain on sales-leaseback agreement							$ 6,100,000
Recent Implemented Accounting Pronouncements [Member]
Basis Of Presentation [Line Items]
Reclassification of outstanding debt issuance costs, due to adoption of ASU standard									$ 57,100,000
Reclassification of accrued expenses to deferred income taxes, due to adoption of ASU standard									$ 1,700,000
Subsequent Event [Member]
Basis Of Presentation [Line Items]
Per common share quarterly dividend										$ 0.225