Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding at June 30, 2014, Shares	1,419,598
Granted, Shares	3,712
Exercised, Shares	(218,610)
Forfeited or expired, Shares	(62,563)
Outstanding at December 31, 2014, Shares	1,142,137	1,419,598
Exercisable at December 31, 2014, Shares	694,303
Outstanding at June 30, 2014, Weighted Average Exercise Price Per Share	$ 65.90
Granted, Weighted Average Exercise Price Per Share	$ 107.22
Exercised, Weighted Average Exercise Price Per Share	$ 49.16
Forfeited or expired, Weighted Average Exercise Price Per Share	$ 78.39
Outstanding at December 31, 2014, Weighted Average Exercise Price Per Share	$ 68.56	$ 65.90
Exercisable at December 31, 2014, Weighted Average Exercise Price Per Share	$ 74.60
Outstanding, Weighted Average Remaining Contractual Term (Years)	6 years 18 days	6 years 8 months 12 days
Exercisable at December 31, 2014, Weighted Average Remaining Contractual Term (Years)	4 years 7 months 10 days
Outstanding at June 30, 2014, Aggregate Intrinsic Value	$ 62,204
Outstanding at December 31, 2014, Aggregate Intrinsic Value	46,633	62,204
Exercisable at December 31, 2014, Aggregate Intrinsic Value	$ 25,342