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Share-Based Compensation Plans - Narrative (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2012 requirement $ / shares | Dec. 31, 2017 USD ($) year $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum exercisable period for stock options (years) |  | 10 years |  |  |
Participant vested in an annual deferral accounts |  | 100.00% |  |  |
Involuntary termination age (year) | year |  | 65 |  |  |
Employee stock purchase plan expense | $ |  | $ 6,100 | $ 6,200 | $ 4,900 |
Nonvested awards, compensation cost not yet recognized | $ |  | $ 19,800 |  |  |
Options granted subject to certain conditions in order for them to become exercisable (shares) |  | 650,000 |  |  |
Vesting requirement share price during vesting period | $ / shares |  | $ 40 |  |  |
Trading days of voting common stock for vesting requirement | 5 days | 10 days |  |  |
Cash received from exercise of options | $ |  | $ 2,000 |  |  |
Number of vesting requirements | requirement | 2 |  |  |  |
Second vesting requirement for voting common stock (usd per share) | $ / shares | $ 17.18 |  |  |  |
Director | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Voting common stock issued (shares) |  | 31,962 |  |  |
Voting common stock issued | $ |  | $ 900 |  |  |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (years) |  | 5 years |  |  |
Options expiration date (years) |  | 10 years |  |  |
Service requirement (years) |  | 5 years |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of exercisable stock options (shares) |  | 96,963 |  |  |
Number of shares granted (shares) |  | 776,500 |  |  |
Tax benefit from exercise of options | $ |  | $ 10,200 |  |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (years) |  | 3 years |  |  |
Number of units vested (shares) |  | 256,078 |  |  |
Number of restricted stock units granted (shares) |  | 218,449 |  |  |
Restricted stock units vesting percentage per year |  | 33.33% |  |  |
Minimum | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (years) |  | 3 years |  |  |
Maximum | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (years) |  | 5 years |  |  |
2010 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fully diluted tangible book value |  | 50.00% |  |  |
Maximum number of shares that may be issued under 2010 plan (shares) |  | 3,666,667 |  |  |
2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of shares that may be issued under 2014 plan (shares) |  | 2,750,000 |  |  |
Aggregate number of shares of common stock available for grant (shares) |  | 1,621,444 |  |  |
2004 Plan | Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units vested (shares) |  | 375,402 |  |  |
Number of restricted stock units granted (shares) |  | 177,205 |  |  |
BRRP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units outstanding (shares) |  | 263,517 |  |  |
BRRP | Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (years) |  | 5 years |  |  |
Number of restricted stock units granted (shares) |  | 41,244 |  |  |
BRRP | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Receipt deferral percentage under BRRP plan |  | 25.00% |  |  |
BRRP | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Receipt deferral percentage under BRRP plan |  | 50.00% |  |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan expense | $ |  | $ 132 | $ 103 | $ 80 |
Purchase price under employee stock purchase plan (percent) |  | 85.00% |  |  | 85.00%
Purchase price under employee stock purchase plan, discount (percent) |  | 15.00% |  |  | 15.00%

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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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