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Financial Statement Details (Tables)
 3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Billed Accounts Receivable, Net
Billed accounts receivable, net consisted of the following (in thousands):
 
March 31, 2017
 
December 31, 2016
Billed accounts receivable
$
193,708

 
$
217,360

Allowance for doubtful accounts
(5,889
)
 
(5,884
)
Billed accounts receivable, net
$
187,819

 
$
211,476
Schedule of Goodwill
Changes in carrying amount of goodwill by segment for the three months ended March 31, 2017 were as follows (in thousands):
 
Total
 
Clinical
Development
Services
 
Phase I
Services
Balance at December 31, 2016:
 
 
 
 
 
Gross carrying amount
$
568,668

 
$
560,526

 
$
8,142

Accumulated impairment losses
(16,166
)
 
(8,024
)
 
(8,142
)
Goodwill net of accumulated impairment losses
552,502

 
552,502

 
—

2017 Activity:
 
 
 
 
 
Impact of foreign currency translation
569

 
569

 
—

Balance at March 31, 2017:
 
 
 
 
 
Gross carrying amount
569,237

 
561,095

 
8,142

Accumulated impairment losses
(16,166
)
 
(8,024
)
 
(8,142
)
Goodwill net of accumulated impairment losses
$
553,071

 
$
553,071

 
$
—
Schedule of Accumulated Other Comprehensive Loss, Net of Taxes
Accumulated other comprehensive loss, net of tax, consisted of the following (in thousands):
 
March 31, 2017
 
December 31, 2016
Foreign currency translation adjustments
$
(38,510
)
 
$
(43,356
)
Unrealized gains on derivative instruments, net of tax
1,256

 
1,106

Accumulated other comprehensive loss, net of tax
$
(37,254
)
 
$
(42,250
)
Reclassification out of Accumulated Other Comprehensive Income
The tax effects allocated to each component of other comprehensive income for the three months ended March 31, 2017 were as follows (in thousands):
 
Before-Tax Amount
 
Tax (Expense) or Benefit
 
Net-of-Tax Amount
Foreign currency translation adjustments (a)
$
4,846

 
$
—

 
$
4,846

Unrealized gain on derivative instruments:
 
 
 
 
 
Unrealized gains arising during period
305

 
(112
)
 
193

Less: reclassification adjustment for gains realized in net income
(68
)
 
25

 
(43
)
Net unrealized gains
237

 
(87
)
 
150

Other comprehensive income
$
5,083

 
$
(87
)
 
$
4,996


(a) Income taxes are not provided for foreign currency translation adjustments relating to investments in international subsidiaries that are intended to be held indefinitely.
Changes in accumulated other comprehensive loss, net of tax were as follows (in thousands):
 
Unrealized gain on derivative instruments, net of tax
 
Foreign currency translation adjustments
 
Total
Balance at December 31, 2016
$
1,106

 
$
(43,356
)
 
$
(42,250
)
Other comprehensive gain before reclassifications
193

 
4,846

 
5,039

Amount of gain reclassified from accumulated other comprehensive loss into statement of operations
(43
)
 
—

 
(43
)
Net current period other comprehensive gain, net of tax
150

 
4,846

 
4,996

Balance at March 31, 2017
$
1,256

 
$
(38,510
)
 
$
(37,254
)
Schedule of Other (Expense) Income, Net
Other (expense) income, net consisted of the following (in thousands):
 
Three Months Ended March 31,
 
2017
 
2016
Net realized foreign currency (loss) gain
$
(670
)
 
$
2,870

Net unrealized foreign currency (loss) gain
(2,707
)
 
(7,774
)
Other, net
(80
)
 
(213
)
Total other (expense) income, net
$
(3,457
)
 
$
(5,117
)