Organization and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions			1 Months Ended		12 Months Ended
	Jun. 05, 2015 USD ($) $ / shares shares	Mar. 10, 2014 USD ($) $ / shares shares	Jun. 30, 2015 shares	Mar. 31, 2014 shares	Dec. 31, 2015 Segment shares	Dec. 31, 2014 shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of reportable segments | Segment					4
Number of common units issued in public offering (in shares) | shares	7,000,000	13,800,000	7,000,000	13,800,000
Public offering price per common unit (in dollars per share) | $ / shares	$ 30.07	$ 33.50
Net proceeds from public offering	$ 209.9	$ 449.5
Net proceeds used to acquire newly issued partnership units		$ 146.1
Number of newly issued partnership units acquired (in shares) | shares	7,000,000	4,500,000
Net proceeds used to acquire partnership units from other limited partners		$ 303.4
Number of partnership units acquired from other limited partners (in shares) | shares	7,000,000	9,300,000	7,000,000	9,300,000
Approximate amount of dilution		$ 116.8
Deferred tax asset	$ 59.6	67.8
Increase in partners' capital	8.1	9.7
Deferred tax liability	2.6
Tax receivable agreement liability increase (decrease) from partnership unit acquisition	$ (51.5)	$ (58.1)
Common stock, units outstanding | shares					80,408,702	67,761,012
Partners’ Capital
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of newly issued partnership units acquired (in shares) | shares		4,500,000