Revolving Line of Credit - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2015	Nov. 16, 2015
Line Of Credit Facility [Line Items]
Outstanding borrowings	$ 66,000,000
Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Interest paid	$ 223,000
Revolving Credit Facility [Member] \| Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 300,000,000
Revolving line of credit maturity date	Nov. 16, 2020
Debt instrument, interest rate	1.60%
Debt instrument, description of variable rate basis	Borrowings under the Credit Facility bear interest at a rate of either (1) Wells Fargo Bank’s prime rate (subject to certain higher rate determinations) plus a margin of 0.25% to 1.00% or (2) the 30, 60, 90 or 180 day LIBOR rate plus a margin of 1.25% to 2.00%.
Outstanding borrowings	$ 66,000,000
Line of credit facility, unused borrowing capacity	$ 234,000,000
Revolving Credit Facility [Member] \| Credit Agreement [Member] \| Minimum [Member] \| Prime Commercial Lending Rate [Member]
Line Of Credit Facility [Line Items]
Line of credit facility interest rate	0.25%
Revolving Credit Facility [Member] \| Credit Agreement [Member] \| Minimum [Member] \| Libor Rate [Member]
Line Of Credit Facility [Line Items]
Line of credit facility interest rate	1.25%
Revolving Credit Facility [Member] \| Credit Agreement [Member] \| Maximum [Member] \| Prime Commercial Lending Rate [Member]
Line Of Credit Facility [Line Items]
Line of credit facility interest rate	1.00%
Revolving Credit Facility [Member] \| Credit Agreement [Member] \| Maximum [Member] \| Libor Rate [Member]
Line Of Credit Facility [Line Items]
Line of credit facility interest rate	2.00%
Letter of Credit [Member] \| Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Letters of credit, outstanding	$ 1,500,000
Line of credit maturity period	2016
Letter of Credit [Member] \| Revolving Credit Facility [Member] \| Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 10,000,000

Line of credit facility expiration year.

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The amount of cash paid for interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

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Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Line-of-Credit Arrangement
-URI http://asc.fasb.org/extlink&oid=6517033

+ Details

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