Employee Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
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

Employer match contributed to defined contribution retirement savings plan percentage.

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- Definition

Employer Vested To Defined Contribution Retirement Savings Plan Percentage

+ References

No definition available.

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- Definition

Maximum salary of employee allowed to purchase shares under purchase plan.

+ References

No definition available.

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- Definition

Minimum threshold period worked by employees.

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- Definition

The cumulative number of shares of common stock issued under the employee stock purchase plan.

+ References

No definition available.

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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