Stockholders' Equity (Summary of Activity Related to Restricted Stock Units) (Detail) - $ / shares	7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding beginning balance		256,191	223,752
Outstanding, shares beginning balance		1,007,301
Granted		304,149	332,782	504,255
Forfeited		(45,642)
Vested and issued		(403,812)
Vested and unissued		(27,362)
Outstanding at December 31, 2016	243,796	243,796	256,191	223,752
Outstanding, shares at December 31, 2016	834,634	834,634	1,007,301
Weighted-Average Grant Date Fair Value Per Share
Outstanding at December 31, 2015		$ 39.74
Granted		57.57	$ 45.13	$ 42.54
Forfeited		48.42
Vested and Issued		37.87
Vested and Unissued		32.92
Outstanding at December 31, 2016	$ 42.11	$ 42.11	$ 39.74
Performance Shares [Member]
Unvested shares
Outstanding, shares beginning balance		293,413
Granted		147,644	238,690	54,723
Forfeited		(33,335)
Vested and issued		(122,960)
Outstanding, shares at December 31, 2016	284,762	284,762	293,413
Weighted-Average Grant Date Fair Value Per Share
Outstanding at December 31, 2015		$ 44.47
Granted		56.75	$ 44.96	$ 42.33
Forfeited		43.66
Vested and Issued		44.20
Outstanding at December 31, 2016	$ 51.11	$ 51.11	$ 44.47
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding beginning balance	490,112
Cash settled	(265,183)
Outstanding at December 31, 2016	224,929	224,929
Progressive Waste Solutions Ltd. [Member] | Performance Shares [Member]
Unvested shares
Outstanding beginning balance	206,856
Cash settled	(144,862)
Outstanding at December 31, 2016	61,994	61,994