XML 82 R70.htm IDEA: XBRL DOCUMENT v3.5.0.2
Share-Based Payments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
General vesting period   3 years  
Total unrecognized compensation cost related to unvested share-based payments $ 58,600,000 $ 58,600,000  
Weighted average period for unrecognized compensation cost expected to be recognized (in years)   1 year 8 months 20 days  
Proceeds from exercise of stock options   $ 16,718,000 $ 7,578,000
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option expire from date of grant, period   10 years  
Performance Cycle 2016-2018 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period for evaluation of EPS target   3 years  
Period for evaluation of TSR   3 years  
Share-based compensation $ 0 $ 0