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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 366,619,000 | $ 177,367,000 | $ 394,701,000 | $ 315,349,000
Cash equivalents | 189,800,000 |  | 92,500,000 |
Cash and cash equivalents held in domestic bank accounts | 254,700,000 |  | 254,100,000 |
Cash and cash equivalents held in foreign bank accounts | 111,900,000 |  | 140,600,000 |
Number of days after accounts receivable are treated as delinquent | 30 days |  | 30 days |
Number of days related to outstanding accounts receivable for analysis of the allowance for doubtful accounts | At least 90 days |  | At least 90 days |
Total allowances for doubtful accounts | 5,426,000 |  | 5,447,000 |
Current retainage balances | 192,300,000 |  | 180,600,000 |
Non-current retainage balances | 29,300,000 |  | 22,500,000 |
Unbilled receivables | 144,300,000 |  | 127,500,000 |
Decrease in fair value of reporting units considered, for impairment calculation |  |  | 10.00% |
Payment to acquire equity method investment | 8,545,000 | 4,906,000 |  |
Change orders and/or claims | 222,400,000 |  | 205,000,000 |
Fiber Optic Licensing Terms, Minimum in years | 5 years | 5 years | 5 years |
Fiber Optic Licensing Terms, Maximum in years | 25 years | 25 years | 25 years |
Fiber optic deferred revenue | 46,300,000 |  | 46,400,000 |
Fiber optic non-current deferred revenue | 37,100,000 |  | 37,700,000 |
Total amount of unrecognized tax benefits relating to uncertain tax positions | 53,500,000 |  |  |
Amount of unrecognized tax benefits change from year-end relating to uncertain tax positions | 2,300,000 |  |  |
Amount expected to decrease due to settlements of audits or as a result of the expiration of certain statutes of limitations | 11,500,000 |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity Method Investment ownership | 20.00% |  |  |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity Method Investment ownership | 50.00% |  |  |
Howard Midstream Energy Partners, LLC. [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Equity Method Investment ownership | 31.00% |  |  |
Balance of equity ownership interest | 99,000,000 |  | 90,500,000 |
Payment to acquire equity method investment | $ 8,500,000 |  |  |

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