Stockholders' Equity (Restricted Stock Units Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Units (RSUs) [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units granted		304,149	332,782	504,255
Weighted average grant-date fair value of award		$ 57.57	$ 45.13	$ 42.54
Total fair value of stock units granted		$ 17,510	$ 15,019	$ 21,449
Stock units becoming free of restrictions		431,174	478,686	563,117
Weighted average restriction period (in years)		3 years 10 months 24 days	3 years 10 months 24 days	3 years 10 months 24 days
Performance Shares [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units granted		147,644	238,690	54,723
Weighted average grant-date fair value of award		$ 56.75	$ 44.96	$ 42.33
Total fair value of stock units granted		$ 8,379	$ 10,732	$ 2,316
Stock units becoming free of restrictions		122,960
Weighted average restriction period (in years)		4 years	3 years 9 months 18 days	2 years 9 months 18 days
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units becoming free of restrictions	14,757
Progressive Waste Solutions Ltd. [Member] | Performance Shares [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units becoming free of restrictions	54,989