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Capital Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stockholders Equity Note [Line Items] |  |  |
Intrinsic value of options exercised | $ 168 | $ 1,070 | $ 699
Average remaining contractual life of options outstanding | 9 months |  |
Tax benefit recognized on stock option exercised | 71 | 449 | 238
Restricted Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Shares of Restricted Stock Granted | 271,532 | 653,229 | 424,436
Market value of common stock on the date of grant | $ 30.09 | $ 21.70 | $ 19.45
Minimum forfeiture rate for restricted stock awards | 0.00% |  |
Maximum forfeiture rate for restricted stock awards | 5.00% |  |
Compensation expense | 12,738 | 10,637 | 6,591
Total fair value of shares vested during the period | 10,161 | 9,702 | 5,658
Recognized tax benefits related to shares vested during the period | 4,268 | 4,075 | 2,188
Unrecognized compensation expense | 14,395 |  |
Compensation expense recognition period (in years) | 2 years |  |
Restricted stock awards vested | 522,129 | 489,033 | 288,204
Shares of restricted stock, forfeited | 22,653 | 14,423 | 1,920
Restricted Stock | Director |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 1 year |  |
Restricted Stock | Employee Scenario One |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 3 years |  |
Restricted Stock | Employee Scenario Two |  |  |
Stockholders Equity Note [Line Items] |  |  |
Award vesting period for restricted stock granted | 4 years |  |
Restricted Stock | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the date of grant | $ 27.92 |  |
Restricted Stock | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the date of grant | $ 33.74 |  |
Restricted Stock Units (RSUs) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Minimum forfeiture rate for restricted stock awards | 0.00% |  |
Maximum forfeiture rate for restricted stock awards | 5.00% |  |
Total fair value of shares vested during the period | 8,723 | 4,400 |
Recognized tax benefits related to shares vested during the period | 3,663 | 1,848 |
Compensation expense recognition period (in years) | 1 year |  |
Number of hypothetical shares of common stock | 802,529 |  |
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% |  |
Percentage of IRR excpected | 11.50% |  |
Restricted stock awards vested | 295,751 | 196,051 |
Restricted stock unit conversion into share of common stock, conversion ratio | 1 | 1 |
Dividends paid on vested restricted stock units | 939 | 600 |
Shares of restricted stock, forfeited | 11,498 |  |
Compensation expense | 4,148 | 4,433 | 3,101
Actual cumulative forfeitures (in units) | 11,498 |  |
Assumed maximum IRR for all grants | 12.50% |  |
Unrecognized Compensation expense related to outstanding restricted stock | $ 4,048 |  |
Restricted Stock Units (RSUs) | Amended And Restated Long Term Incentive Plan |  |  |
Stockholders Equity Note [Line Items] |  |  |
Number of hypothetical shares of common stock | 115,107 | 152,955 | 153,727
Restricted Stock Units (RSUs) | Minimum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the date of grant | $ 19.35 |  |
Restricted Stock Units (RSUs) | Maximum |  |  |
Stockholders Equity Note [Line Items] |  |  |
Market value of common stock on the date of grant | $ 29.44 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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