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Stock-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares issued | 53,199,720 | 53,154,666 |
Vesting period | 3 years |  |
Number of stock options outstanding | 0 | 30,224 |
Number of stock options exercisable | 0 |  |
Tax effect from stock-based plans | $ 837,000 | $ 331,000 | $ 495,000
Capitalization of share based payment costs | $ 471,000 | $ 471,000 |
Options granted | 0 | 0 | 0
Total intrinsic value of options exercised | $ 494,000 | $ 958,000 | $ 684,000
Weighted average fair value per share of employee stock purchase plan rights, granted | $ 8.16 | $ 6.37 | $ 5.76
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value per share of employee stock purchase plan rights, granted | $ 32.89 |  |
Total intrinsic value of options exercised and fair value of RSUs vested | $ 12,868,000 | $ 12,106,000 | $ 19,221,000
Unrecognized compensation cost | $ 11,585,000 |  |
Estimated weighted average amortization period | 9 months 26 days |  |
Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 day |  |
Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 13 months |  |
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted to employees under plans prior to 2001, vested after one year | 33.30% | 33.30% | 33.30%
RSUs Granted to Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award vesting period description | Employees who are at least 60 years old and have a minimum of 10 Years of Service (as defined in the applicable RSU agreement) are expensed immediately. |  |
Minimum years of service for RSU | 10 years |  |
RSUs Granted to Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award vesting period description | Earliest of (1) one day prior to the next annual meeting, (2) 13 months from date of grant, or (3) the effective date of an acquisition. |  |
Employee Stock Purchase Plan - Second Amended and Restated [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 400,000 |  |
Percentage of Common Stock through payroll deductions | 10.00% |  |
Amount of payroll deduction | $ 21,250 |  |
Percentage of closing price of the Common Stock | 85.00% |  |
Common stock, shares issued |  | 20,053 |
Common stock, exercise price |  | $ 24.52 |
Employee Stock Purchase Plan - Second Amended and Restated [Member] | Offer Terminate [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of closing price of the Common Stock | 85.00% |  |
Employee Stock Purchase Plan - Third Amended and Restated [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 1,950,000 |  |
Percentage of payroll deduction to compensation | Up to 10% |  |
Percentage of Common Stock through payroll deductions | 10.00% |  |
Amount of payroll deduction | $ 21,250 |  |
Percentage of closing price of the Common Stock | 85.00% |  |
Common stock, shares issued |  | 69,474 |
Common stock, exercise price |  | $ 24.52 |
Employee Stock Purchase Plan - Third Amended and Restated [Member] | Offer Terminate [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of closing price of the Common Stock | 85.00% |  |
2014 ESPP Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 2,500,000 |  |
Percentage of payroll deduction to compensation | Up to 10% |  |
Percentage of Common Stock through payroll deductions | 10.00% |  |
Amount of payroll deduction | $ 21,250 |  |
Percentage of closing price of the Common Stock | 85.00% |  |
Common stock, shares issued | 140,531 | 82,481 |
Common stock, exercise price |  | $ 24.33 |
Shares reserved for future issuance | 2,276,988 |  |
2014 ESPP Plan [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, exercise price | $ 30.74 |  |
2014 ESPP Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, exercise price | $ 31.34 |  |
2014 ESPP Plan [Member] | Offer Terminate [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of closing price of the Common Stock | 85.00% |  |
Stock Incentive Plan 2014 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for future issuance | 16,953,488 |  |
Shares available for future grant | 18,000,000 |  |
Percentage of exercise price fair value option grant in period | 100.00% |  |
Number of shares returned for each common stock | 2.4 |  |
Stock Incentive Plans 2001 and After [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of exercise price fair value option grant in period | 100.00% |  |
Stock options granted to employees under plans prior to 2001, vested per quarter thereafter | 6.25% |  |
Stock options expired | 10 years |  |
Stock Incentive Plans 2001 and After [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted to employees under plans prior to 2001, vested after one year | 25.00% |  |
1997 Director Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award vesting period description | Options granted to directors generally vested at the earliest of (1) one day prior to the next annual meeting, (2) 13 months from the date of grant, or (3) the effective date of an acquisition. |  |
Number of stock options outstanding | 0 |  |
1997 Director Plan [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 day |  |
1997 Director Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 13 months |  |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received from employees as a result of employee stock option exercises | $ 592,000 | $ 1,605,000 |
Tax effect from stock-based plans | $ 21,000 | $ 175,000 |

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