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Summary of Major Types of Costs, Cumulative Costs Incurred and Total Cost Expected Associated With Restructuring Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 45 | $ 279 | $ 14,732
Cumulative Costs Incurred To Date | 15,056 |  |
Total Expected Plan Costs | 15,056 |  |
Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 45 | 279 | 14,732
Severance and related employee benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0 | 0 |
Cumulative Costs Incurred To Date | 13,162 |  |
Total Expected Plan Costs | 13,162 |  |
Severance and related employee benefits | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0 | 0 | 13,162
Contract termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0 | 0 |
Cumulative Costs Incurred To Date | 1,159 |  |
Total Expected Plan Costs | 1,159 |  |
Contract termination costs | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0 | 0 | 1,159
Other costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 45 | 279 |
Cumulative Costs Incurred To Date | 735 |  |
Total Expected Plan Costs | 735 |  |
Other costs | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 45 | $ 279 | $ 411

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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