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Capital Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock | Dec. 31, 2010 Restricted Stock | Dec. 31, 2012 Restricted Stock Certain of the restricted stock granted to employees | Dec. 31, 2012 Restricted Stock Remaining restricted stock granted to employees | Dec. 31, 2012 Restricted Stock Directors And Employees | Dec. 31, 2012 Restricted Stock Units (RSUs) | Dec. 31, 2011 Restricted Stock Units (RSUs) | Dec. 31, 2010 Restricted Stock Units (RSUs) | Dec. 31, 2012 Restricted Stock Units (RSUs) Amended And Restated Long Term Incentive Plan | Dec. 31, 2011 Restricted Stock Units (RSUs) Amended And Restated Long Term Incentive Plan | Dec. 31, 2010 Restricted Stock Units (RSUs) Amended And Restated Long Term Incentive Plan | Dec. 31, 2012 2008 Grant | Dec. 31, 2010 2008 Grant | Dec. 31, 2010 2009 Grant | Jun. 30, 2010 Colombian Partners
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,112,723
Intrinsic value of options exercised | $ 1,070 | $ 699 | $ 9,836 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized tax benefit on options exercised | 449 | 238 | 2,680 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining contractual life of options outstanding | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of Restricted Stock Granted | 653,229 | 424,436 | 683,921 |  |  |  |  |  | 653,229 |  |  |  |  |  |  |  |  |  |
Minimum fair value of restricted stock granted |  |  |  | $ 21.63 |  |  |  |  |  | $ 18.34 |  |  |  |  |  |  |  |  |
Maximum fair value of restricted stock granted |  |  |  | $ 22.97 |  |  |  |  |  | $ 21.63 |  |  |  |  |  |  |  |  |
Minimum forfeiture rate for restricted stock awards |  |  |  | 0.00% |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Maximum forfeiture rate for restricted stock awards |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Award vesting period range for restricted stock granted to employees |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |  |  |  |  |  |
Award vesting period range for restricted stock granted to directors |  |  |  | Over one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  | 10,637 | 6,591 | 4,928 |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested during the period |  |  |  | 9,702 | 5,658 | 3,272 |  |  |  | 4,400 |  |  |  |  |  |  |  |  |
Recognized tax benefits related to shares vested during the period |  |  |  | 4,075 | 2,188 | 1,087 |  |  |  | 1,848 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to restricted stock awards |  |  |  | 18,341 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognition period (in years) |  |  |  | 2 years |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Number of hypothetical shares of common stock |  |  |  |  |  |  |  |  |  | 994,671 |  |  | 152,955 | 153,727 | 396,429 |  |  |  |
Percentage of IRR, which is the threshold |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |
Percentage of IRR, which is the target |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |
Percentage of IRR, which is the maximum |  |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |
Percentage of restricted stock units vest |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Incremental compensation expense |  |  | 435 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of IRR expected restricted stock units grants | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  | 12.50% |
Additional compensation expense recognized upon determination that maximum IRR level is reached | 1,609 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 823 | 377 |
Restricted stock unit awards vested | 489,033 | 288,204 | 190,589 |  |  |  |  |  |  | 196,051 |  |  |  |  |  |  |  |  |
Restricted stock unit convertion into share of common stock, conversion ratio |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Dividends paid on vested restricted stock units |  |  |  |  |  |  |  |  |  | 600 |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  | 4,433 | 3,101 | 3,424 |  |  |  |  |  |  |
Actual cumulative forfeitures (in units) |  |  |  |  |  |  |  |  |  | 11,608 |  |  |  |  |  |  |  |  |
Assumed maximum IRR for all grants |  |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |
Unrecognized Compensation expense related to outstanding restricted stock |  |  |  |  |  |  |  |  |  | $ 4,890 |  |  |  |  |  |  |  |  |

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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