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STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 03, 2017 | May 10, 2017 | Feb. 07, 2017 | Dec. 05, 2016
Class Of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  | 2,000,000,000 | 2,000,000,000 |  |  |  |
Common stock, par value |  | $ 0.1 | $ 0.1 |  |  |  |
Common stock, shares issued |  | 220,382,343 | 218,700,394 |  |  |  |
Common stock, shares outstanding |  | 216,278,040 | 217,446,205 |  |  |  |
Granted shares of restricted stock |  | 1,099,756 |  |  |  |  |
Corporation has authorized shares of preferred stock |  | 50,000,000 | 50,000,000 |  |  |  |
Preferred stock, par value |  | $ 1 |  |  |  |  |
Liquidation value per share |  | $ 25 |  |  |  |  |
Repurchased of common stock |  | 438,891 | 291,759 |  |  |  |
Treasury Stock Shares |  | 4,104,303 | 1,254,189 |  |  |  |
Secondary Offering Of Common Stock |  |  |  | 20,000,000 |  | 20,000,000 |
Purchase Of Common Stock Secondary Offering |  |  |  |  |  | 3,000,000 | 2,700,000
Conversion Of Stock Shares Issued1 | 852,831 |  |  |  |  |  |
Legal Surplus Amount |  | $ 59,693 | $ 52,436 |  |  |  |
Legal Surplus Amount Additions |  | $ 7,300 | $ 9,600 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Legal surplus reserve rate |  | 10.00% |  |  |  |  |
Omnibus Plan [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Restricted stock granted to senior executive officers |  | 7,558,450 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Repurchased of common stock |  | 243,102 | 65,498 |  |  |  |
Forefeited |  | 2,411,223 |  |  |  |  |
Number of vested shares |  | 1,050,356 |  |  |  |  |
Thomas H Lee Partners [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Percentage Of Stock Ownership |  | 5.00% |  |  |  |  |
Secondary Offering Of Common Stock |  |  |  | 10,000,000 |  | 10,000,000 | 9,000,000
Oaktree Capital Management [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Percentage Of Stock Ownership |  | 5.00% |  |  |  |  |
Secondary Offering Of Common Stock |  |  |  | 10,000,000 |  | 10,000,000 | 9,000,000
Department Of Treasury [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Secondary Offering Of Common Stock |  |  |  |  | 10,291,553 |  |
7.125% Noncumulative Perpetual Monthly Income Preferred Stock, Series A [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 7.125% |  |  |  |  |
8.35% Noncumulative Perpetual Monthly Income Preferred Stock, Series B [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 8.35% |  |  |  |  |
7.40% Noncumulative Perpetual Monthly Income Preferred Stock, Series C [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 7.40% |  |  |  |  |
7.25% Noncumulative Perpetual Monthly Income Preferred Stock, Series D [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 7.25% |  |  |  |  |
7.00% Noncumulative Perpetual Monthly Income Preferred Stock, Series E [Member] |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  | 7.00% |  |  |  |  |

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