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Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortization of discount on contingent earnout liability	$ (430)	$ (223)
Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(33,709)
Ending balance	(39,370)
Contingent Purchase Price Liabilities [Member] | Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(33,709)	(24,817)
Additions from business acquisitions	(17,526)	(17,755)
Settlement of contingent purchase price liabilities	11,644	7,945
Change in fair value of contingencies	651	936
Amortization of discount on contingent earnout liability	(430)	(223)
Ending balance	$ (39,370)	$ (33,914)

X

- Definition

Additions to the contingent liability resulting from business acquisitions.

+ References

No definition available.

+ Details

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- Definition

Change in fair value of contingency.

+ References

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- Definition

Contingent purchase price liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Payment of contingent purchase price payable.

+ References

No definition available.

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X

- Definition

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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

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