Revenue - Additional Information (Detail1) - Pharma Research and Development Services [Member] $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 96.1
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	58.00%
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	42.00%
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 51.4
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	23.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	30.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	47.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 44.7

Revenue remaining performance obligation expected timing of satisfaction percentage.

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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