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Employee Benefit Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of amount vested to defined contribution retirement savings plan | 100.00% |  |
Expense for continuing and discontinued operations under employee benefit plan | $ 3,600,000 | $ 3,800,000 | $ 4,600,000
Percentage of fair market value of common stock | 95.00% |  |
Percentage of shares limited to an employee under employee stock purchase plan | 10.00% |  |
Maximum salary of employee allowed to purchase shares under employee stock purchase plan | $ 25,000 |  |
Common stock issued under employee stock purchase plan | 3,200,000 |  |
0-2% Contribution [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of amount contributed to defined contribution retirement savings plan | 50.00% | 50.00% | 50.00%
2-4% Contribution [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of amount contributed to defined contribution retirement savings plan | 25.00% | 25.00% | 25.00%
Minimum number of hours worked | 1000 hours |  |
Employee Stock Purchase Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Authorized to grant the common stock under the employee stock purchase plan | 4,000,000 |  |

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Discount rate from fair value on offering date that participants pay for 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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