Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 32,429us-gaap_NetIncomeLoss	$ 134,358us-gaap_NetIncomeLoss	$ 122,904us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	81,371us-gaap_DepreciationAndAmortization	32,110us-gaap_DepreciationAndAmortization	26,177us-gaap_DepreciationAndAmortization
Amortization of debt issuance cost and discount	2,113	0	0
Equity-based compensation	19,891us-gaap_ShareBasedCompensation	13,109us-gaap_ShareBasedCompensation	14,727us-gaap_ShareBasedCompensation
Goodwill impairment charges	0	0	9,114
Impairment of long term investment	2,333us-gaap_ImpairmentOfInvestments	0us-gaap_ImpairmentOfInvestments	0us-gaap_ImpairmentOfInvestments
Excess tax benefit from share-based compensation	(6,127)	(4,277)	(1,578)
Loss on sale of property and equipment	1,793us-gaap_GainsLossesOnSalesOfAssets	224us-gaap_GainsLossesOnSalesOfAssets	311us-gaap_GainsLossesOnSalesOfAssets
Gain on sale of business	0	(201)	(930)
Deferred income taxes	(44,340)us-gaap_DeferredIncomeTaxExpenseBenefit	7,929us-gaap_DeferredIncomeTaxExpenseBenefit	8,067us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on forward interest rate swaps	4,649	0	0
Changes in assets and liabilities, net of businesses acquired:
Accounts receivable, net	(69,628)	(6,488)	(8,647)
Inventories, net	(2,398)us-gaap_IncreaseDecreaseInInventories	2,743us-gaap_IncreaseDecreaseInInventories	11,530us-gaap_IncreaseDecreaseInInventories
Other assets	(12,947)	(342)	7,304
Accounts payable	62,188	7,544	(14,605)
Accrued liabilities	164,269	6,220	(4,193)
Deferred revenue	10,034	2,133	4,351
Income taxes	(5,691)	(242)	16,335
Other operating activities	8,386	(54)	(7,536)
Net cash provided by operating activities	248,325	194,766	183,331
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(3,398,600)	(95,328)	(59,876)
Purchases of property and equipment	(39,291)	(20,211)	(22,443)
Proceeds from the sale of business	0	0	27,580
Acquisition of intangible assets	0	(1,500)	(3,500)
Purchases of long-term investments	(2,454)	(12,021)	(9,125)
Purchases of investments and marketable securities	(651,698)us-gaap_PaymentsToAcquireInvestments	(410,283)us-gaap_PaymentsToAcquireInvestments	(347,609)us-gaap_PaymentsToAcquireInvestments
Maturities of investments and marketable securities	336,329	49,453	145,028
Proceeds from sales of investments and marketable securities	644,378	336,741	164,410
Net cash used in investing activities	(3,111,336)	(153,149)	(105,535)
Cash flows from financing activities:
Payment of debt issuance costs	(24,473)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from issuance of long-term debt	3,188,855	0	0
Purchase of treasury stock	0	(63,102)	(54,373)
Proceeds from exercise of stock options and stock purchase plan purchases	21,725	14,652	3,361
Excess tax benefit from equity-based compensation	6,127	4,277	1,578
Net cash provided by (used in) financing activities	3,192,234	(44,173)	(49,434)
Effect of exchange rate changes on cash	1,900	643	(40)
Net increase (decrease) in cash and cash equivalents	331,123	(1,913)	28,322
Cash and cash equivalents at beginning of period	62,827	64,740	36,418
Cash and cash equivalents at end of period	393,950	62,827	64,740
Supplemental disclosures of cash flow information:
Income taxes paid	$ 17,433us-gaap_IncomeTaxesPaid	$ 18,418us-gaap_IncomeTaxesPaid	$ 20,059us-gaap_IncomeTaxesPaid

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The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Balance Type:	credit
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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the long-term.

+ References

No definition available.

+ Details

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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