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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2012 | Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 500,000 |  |  |  |  |  |  |  | 500,000 | 500,000 |  |  |
Preferred stock, par value |  | $ 0.01 |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Authorized to purchase of common stock under the stock repurchase program |  |  |  |  |  |  |  |  |  | $ 535,000,000 |  |  |  | $ 50,000,000
Cumulative repurchase of common stock |  |  |  |  |  |  |  |  |  | 16,300,000 |  |  |  |
Aggregate cost of repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 474,900,000 |  |  |  |
Dividend declared and paid per share |  | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |  |  |  |
Dividend declared per share |  |  |  |  |  |  |  |  |  |  | $ 0.80 | $ 0.76 |  |
Aggregate dividend declared for the year |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 | $ 13,600,000 |  |
Option Outstanding and vested |  | 583,000 |  |  |  |  |  |  |  | 436,000 | 583,000 |  |  |
Common stock, par value |  | $ 0.01 |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Future awards granted or issued under plans | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in number of shares issuable under plan | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Hours of work per week | 20 hours |  |  |  |  |  |  |  |  |  |  |  |  |
Duration of purchase periods under employee stock purchase plan | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period of stocks acquired under employee stock purchase plan | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Value used to derive maximum number of shares per participant for employee stock purchase | $ 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Employee maximum elected percentage reduction of compensation to purchase shares | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price rate of fair value | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value for RSUs granted |  |  |  |  |  |  |  |  |  | $ 43.84 | $ 43.71 | $ 39.73 |  |
Number of shares received per restricted stock unit on lapse of restrictions and vesting condition met |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Value of RSUs vested and converted to common stock |  |  |  |  |  |  |  |  |  | $ 8,200,000 | $ 9,100,000 | $ 8,700,000 |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  |  |  |  |  |  |  |  | $ 1,500,000 | $ 3,300,000 | $ 4,500,000 |  |
Equity Incentive Plan [Member] | Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 6,350,000 |
Shares returned |  |  |  |  |  |  |  |  |  |  |  |  | 793,275 |
Option expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Future awards granted or issued under plans |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |
Option Outstanding and vested |  |  |  |  |  |  |  |  |  | 36,000 |  |  |  |
Equity Incentive Plan [Member] | Equity Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested period |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Equity Incentive Plan [Member] | Equity Plan [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future awards granted or issued under plans |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Equity Incentive Plan [Member] | Equity Plan [Member] | Non-Employee Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested period |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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