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Stock-Based Compensation Plans - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Tranche
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Tranche
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under ESPP | shares     96,350 85,659
Incentive plan, percentage of options expected to vest over the vesting period 93.10%   93.10%  
Incentive plan, weighted-average grant date fair value of stock options granted | $ / shares     $ 5.59 $ 6.49
Incentive plan, total intrinsic value of stock options exercised     $ 6,200,000 $ 10,900,000
Expected dividend yield     0.00%  
Dividend paid | $ / shares     $ 0  
Number of tranches | Tranche 3   3  
Stock-based compensation expenses $ 13,100,000 $ 5,400,000 $ 22,572,000 9,291,000
Stock-based compensation expenses tax benefits $ 4,900,000 $ 2,000,000 8,500,000 3,500,000
Proceeds from exercises of stock options     7,986,000 10,634,000
Actual tax benefit realized from tax deductions of option exercises     $ 2,300,000 $ 4,100,000
Employee Stock Purchase Plan 1999 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock reserved for issuance | shares 4,500,000   4,500,000  
Permitted designation for purchase of common stock under ESPP     Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter.  
Employee participating annual base compensation designated for purchase of common stock, amount $ 25,000   $ 25,000  
Employee participating annual base compensation designated for purchase of common stock, percent 10.00%   10.00%  
Price of common stock purchased under ESPP, description     The price for shares of common stock purchased under the ESPP is 85% of the stock's fair market value on the last business day of the three-month participation period.  
Price of common stock purchased under ESPP, percent     85.00%  
Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vested grant date fair value | $ / shares     $ 7.46  
Share-based compensation, trading price percentage     133.00%  
Consecutive trading days     20 days  
Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vested grant date fair value | $ / shares     $ 7.06  
Share-based compensation, trading price percentage     167.00%  
Consecutive trading days     20 days  
Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, vested grant date fair value | $ / shares     $ 6.50  
Share-based compensation, trading price percentage     200.00%  
Consecutive trading days     20 days  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expenses $ 16,700,000   $ 16,700,000  
Unrecognized compensation expenses, weighted-average recognition periods     2 years 3 months 18 days  
Restricted share awards (RSAs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation awards, shares vested | shares     107,862  
Shares withheld to pay employees' portion of minimum payroll withholding taxes | shares     6,953  
Unrecognized compensation expenses 2,900,000   $ 2,900,000  
Unrecognized compensation expenses, weighted-average recognition periods     1 year 3 months 18 days  
Retention RSAs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation awards, shares vested | shares     533  
Shares withheld to pay employees' portion of minimum payroll withholding taxes | shares     228  
Unrecognized compensation expenses 3,700,000   $ 3,700,000  
Unrecognized compensation expenses, weighted-average recognition periods     7 months 6 days  
Retention RSAs [Member] | Executive Officers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     1 year 3 months 18 days  
Retention RSAs [Member] | Executive Officers [Member] | Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage for each year     50.00%  
Retention RSAs [Member] | Executive Officers [Member] | Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage for each year     50.00%  
Retention RSAs [Member] | Employees other than Named Executive Officers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     9 months 18 days  
Retention RSAs [Member] | Employees other than Named Executive Officers [Member] | Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage for each year     50.00%  
Retention RSAs [Member] | Employees other than Named Executive Officers [Member] | Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage for each year     50.00%  
Performance-Based Restricted Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation awards, shares vested | shares     169,567  
Shares withheld to pay employees' portion of minimum payroll withholding taxes | shares     56,659  
Unrecognized compensation expenses 7,500,000   $ 7,500,000  
Unrecognized compensation expenses, weighted-average recognition periods     1 year 2 months 12 days  
Performance-Based Restricted Share Awards [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected attainment level for the awards granted, percentage     100.00%  
Performance-Based Restricted Share Awards [Member] | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected attainment level for the awards granted, percentage     90.40%  
LTIP Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expenses $ 23,500,000   $ 23,500,000  
Unrecognized compensation expenses, weighted-average recognition periods     2 years 6 months  
2016 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock reserved for issuance | shares 8,000,000   8,000,000  
2016 Incentive Plan | Stock options, stock appreciation rights, restricted stock, restricted stock units and other awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares of Common Stock a participant may receive | shares     3,000,000  
2016 Incentive Plan | Performance shares or Performance units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum aggregate value on the date of grant     $ 9,000,000