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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Operating Loss Carryforwards [Line Items] |
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| Federal income tax rate |
34.00% |
34.00% |
34.00% |
| Federal net operating loss carryforwards expiration period start |
2020 |
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| Federal net operating loss carryforwards expiration period end |
2033 |
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| State operating loss carryforwards expiration period start |
2014 |
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| State net operating loss carryingforwards period end |
2033 |
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| State net operating loss carryingforwards expiration year |
2014 |
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| State net operating loss carryingforwards expiring in initial year |
$ 4,200,000 |
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| Gross deferred tax assets attributable to stock option exercises and vesting of restricted stock units |
5,200,000 |
4,400,000 |
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| Valuation allowance |
1,400,000 |
145,500,000 |
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| Reversal of valuation allowance |
144,000,000 |
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| Unrecognized tax benefits due to uncertain tax positions |
6,400,000 |
6,400,000 |
6,400,000 |
| Unrecognized tax benefits which would effect effective tax rate if recognized |
900,000 |
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| Accrued interest and penalties related to uncertain tax positions |
0 |
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Stock option and restricted stock units [Member]
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| Operating Loss Carryforwards [Line Items] |
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| Gross deferred tax assets attributable to stock option exercises and vesting of restricted stock units |
3,000,000 |
1,600,000 |
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Domestic Tax Authority [Member]
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| Operating Loss Carryforwards [Line Items] |
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| Federal Net operating loss carrying forward |
336,100,000 |
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State and Local Jurisdiction [Member]
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| Operating Loss Carryforwards [Line Items] |
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| Federal Net operating loss carrying forward |
$ 248,800,000 |
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