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Stock-Based Compensation Plans - Summary of Restricted Stock and Restricted Stock Unit Activity (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Outstanding, Unvested, Beginning balance | shares 789,411
Restricted Stock Outstanding, Granted | shares 324,772
Restricted Stock Outstanding, Assumed in acquisition | shares 215,215
Restricted Stock Outstanding, Vested | shares (357,457)
Restricted Stock Outstanding, Cancelled | shares (3,443)
Restricted Stock Outstanding, Unvested, Ending balance | shares 968,498
Weighted-Average Grant Price, Unvested, Beginning balance | $ / shares $ 99.53
Weighted-Average Grant Price, Granted | $ / shares 114.14
Weighted-Average Grant Price, Assumed in acquisition | $ / shares 119.85
Weighted-Average Grant Price, Vested | $ / shares 98.35
Weighted-Average Grant Price, Cancelled | $ / shares 100.95
Weighted-Average Grant Price, Unvested, Ending balance | $ / shares $ 109.38
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Outstanding, Unvested, Beginning balance | shares 761,645
Restricted Stock Outstanding, Granted | shares 218,183
Restricted Stock Outstanding, Vested | shares (325,518)
Restricted Stock Outstanding, Cancelled | shares (28,422)
Restricted Stock Outstanding, Unvested, Ending balance | shares 625,888
Weighted-Average Grant Price, Unvested, Beginning balance | $ / shares $ 96.36
Weighted-Average Grant Price, Granted | $ / shares 113.33
Weighted-Average Grant Price, Vested | $ / shares 92.68
Weighted-Average Grant Price, Cancelled | $ / shares 104.60
Weighted-Average Grant Price, Unvested, Ending balance | $ / shares $ 103.82