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Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |
Loss on contract recognized | $ 1.6 us-gaap_LossOnContracts | $ 0.3 us-gaap_LossOnContracts | $ 4.7 us-gaap_LossOnContracts | $ 18.2 us-gaap_LossOnContracts | $ 10.9 us-gaap_LossOnContracts | $ 0.6 us-gaap_LossOnContracts
Impairment charge of asset held for sale | 3.2 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |  |  |
Increase in allowance for doubtful accounts | $ 3.6 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease |  |  |  |  |

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- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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- Definition Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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