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Equity and EPS (Detail) $ in Thousands |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2015 USD ($) shares | Dec. 31, 2016 board_member shares | Feb. 26, 2016 | Dec. 31, 2015 shares | Sep. 30, 2015 | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Equity [Abstract] |  |  |  |  |  |  |
Number of board members that common stockholders are entitled to elect | board_member |  | 4 |  |  |  |  |
Total number of board members | board_member |  | 9 |  |  |  |  |
Number of board members preferred stock shareholders entitled to elect | board_member |  | 5 |  |  |  |  |
Board of directors, term of service |  | 1 year |  |  |  |  |
Minimum single shareholder ownership percentage to call special stockholder meeting (as a percent) |  | 10.00% |  |  |  |  |
Incremental common shares attributable to dilutive effect of equity unit purchase agreements | 950,000 |  |  |  |  |  |
Stock repurchase program, authorized amount | $ | $ 14,488 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options outstanding (in shares) |  | 0 |  | 0 |  | 4,000 | 10,000
ICP [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity method ownership percentage (percent) |  | 30.00% | 30.00% |  | 30.00% |  |
Affiliated Entity [Member] | ICP [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity method ownership percentage (percent) |  |  |  |  | 70.00% |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of nonvested shares (in shares) |  | 0 |  | 128,500 |  | 278,900 | 569,296
Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of nonvested shares (in shares) |  | 527,486 |  | 437,946 |  | 413,288 | 371,502
The 2004 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of nonvested shares (in shares) |  | 0 |  |  |  |  |
The 2004 Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Authorized shares remaining for issuance |  | 331,000 |  |  |  |  |

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