Share-Based Compensation Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disclosure Share Based Compensation Expenses [Abstract]
Option plan	$ 6,375	$ 5,853	$ 11,953	$ 10,977
Restricted Stock or Unit Expense	6,688	7,973	11,099	18,105
Total share-based compensation before tax	13,063	13,826	23,052	29,082
Tax benefit	4,885	5,168	8,614	10,866
Total share-based compensation expense included in net income	$ 8,178	$ 8,658	$ 14,438	$ 18,216