Stock-Based Compensation - Additional Information (Detail) - USD ($)
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9 Months Ended |
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Sep. 30, 2016 |
May 08, 2007 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options vesting period, Minimum |
1 year
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| Stock options vesting period, Maximum |
5 years
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| Number of stock options outstanding or exercisable |
0
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| Period of recognition for compensation expense, Minimum |
1 year
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| Period of recognition for compensation expense, Maximum |
4 years
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| Expected dividend yield |
0.00%
|
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| Unrecognized stock based compensation expense, net of estimated forfeitures |
$ 11,000,000
|
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| 2007 Omnibus Stock and Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Authorized shares of common stock |
|
4,600,000
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| Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensation expense recognized |
0
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| Restricted stock outstanding, intrinsic value |
$ 17,300,000
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| Restricted common stock, Granted |
628,013
|
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| Performance-based restricted stock, Granted |
199,692
|
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| Average market value of restricted common stock awarded to certain employees and directors of company |
$ 16.17
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| Restricted stock award vesting period, Minimum |
1 year
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| Restricted stock award vesting period, Maximum |
4 years
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| Restricted stock outstanding |
$ 10,200,000
|
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| Restricted Stock [Member] | Directors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted common stock, Granted |
8,220
|
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| Restricted stock outstanding |
$ 200,000
|
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| Average market value of common stock awarded to certain employees and directors of company |
$ 18.25
|
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| Restricted stock award vesting period |
1 year
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| Performance Stock Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected period of expenses |
1 year
|
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| Nonperformance Stock Awards [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected period of expenses |
1 year
|
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| Nonperformance Stock Awards [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expected period of expenses |
4 years
|
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