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Stock-Based Compensation - Summary of Stock Options Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
$35.76 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 35.76
Options Outstanding 689
Options Exercisable 689
Weighted-Average Remaining Contractual Life 6 years 4 months 24 days
$41.43 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 41.43
Options Outstanding 242
Options Exercisable 242
Weighted-Average Remaining Contractual Life 4 years 4 months 24 days
$42.34 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 42.34
Options Outstanding 520
Options Exercisable 520
Weighted-Average Remaining Contractual Life 5 years 4 months 24 days
$44.51 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 44.51
Options Outstanding 506
Options Exercisable 80
Weighted-Average Remaining Contractual Life 7 years 4 months 24 days
$47.59 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 47.59
Options Outstanding 700
Weighted-Average Remaining Contractual Life 9 years 4 months 24 days
$50.63 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 50.63
Options Outstanding 435
Weighted-Average Remaining Contractual Life 8 years 4 months 24 days
$35.76 - $50.63 [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Options Outstanding 3,092
Options Exercisable 1,531
Weighted-Average Remaining Contractual Life 7 years 2 months 12 days
$35.76 - $50.63 [Member] | Minimum [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 35.76
$35.76 - $50.63 [Member] | Maximum [Member]  
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]  
Exercise Price | $ / shares $ 50.63