Share-Based Compensation - Schedule of Restricted Stock Units Award Activity (Detail) - $ / shares		3 Months Ended		12 Months Ended
		Mar. 31, 2017		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion from Performance Shares to Restricted Stock Units upon completion of the spin-offs		671,604
Restricted stock units (RSUs) [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance		1,624,541		1,246,084
Conversion from Performance Shares to Restricted Stock Units upon completion of the spin-offs	[1]	671,604
Effect of the spin-offs		439,113
Granted		1,313,783		1,169,238	679,546	1,883,454
Vested		(876,145)		(683,262)
Forfeited		(47,971)		(107,519)
Outstanding, ending balance		3,124,925		1,624,541	1,246,084
Weighted average grant date fair value, outstanding beginning balance		$ 65.24		$ 73.44
Weighted average grant date fair value, conversion from Performance Shares to Restricted Stock Units upon completion of the spin-offs	[1]	72.42
Weighted average grant date fair value, effect of the spin-offs		57.60
Weighted average grant date fair value, granted		58.02		59.73	$ 82.38	$ 64.59
Weighted average grant date fair value, vested		47.19		70.50
Weighted average grant date fair value, forfeited		47.97		66.90
Weighted average grant date fair value, outstanding ending balance		$ 52.01	[2]	$ 65.24	$ 73.44

[1] Represents all performance shares outstanding as of December 31, 2016.

[2] The weighted average grant date fair value was adjusted to reflect the Conversion Factor.