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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 273,340,000 | $ 488,777,000 | $ 366,619,000 | $ 488,777,000 | $ 394,701,000
Cash equivalents | 66,500,000 | 247,800,000 |  | 247,800,000 |
Cash and cash equivalents held in domestic bank accounts | 134,100,000 | 236,700,000 |  | 236,700,000 |
Cash and cash equivalents held in foreign bank accounts | 139,200,000 | 252,100,000 |  | 252,100,000 |
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 | 5,186,000 | 5,215,000 |  | 5,215,000 |
Current retainage balances | 194,600,000 | 194,500,000 |  | 194,500,000 |
Non-current retainage balances | 55,600,000 | 50,800,000 |  | 50,800,000 |
Unbilled receivables | 211,900,000 | 179,200,000 |  | 179,200,000 |
Decrease in fair value of reporting units considered, for impairment calculation |  | 10.00% |  | 10.00% |
Percent change in contract estimates impact on operating results is less than this percentage | 5.00% |  |  |  |
Change orders and/or claims | 247,200,000 | 241,800,000 |  | 241,800,000 |
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 | 49,700,000 | 48,800,000 |  | 48,800,000 |
Fiber optic non-current deferred revenue | 41,600,000 | 40,200,000 |  | 40,200,000 |
Total amount of unrecognized tax benefits relating to uncertain tax positions | 51,200,000 |  |  |  |
Amount of unrecognized tax benefits change from year-end relating to uncertain tax positions | 2,400,000 |  |  |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months upper bound | 11,000,000 |  |  |  |
Restricted Stock Units to be Settled in Cash [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of common stock shares that may be received by RSU holder | 1 |  |  |  |
Sunrise Powerlink Project [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue associated with change order | $ 165,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity Method Investment ownership | 20.00% |  |  |  |
Minimum [Member] | Restricted Stock Units to be Settled in Cash [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Vesting period for restricted stock units to be settled in cash | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Equity Method Investment ownership | 50.00% |  |  |  |
Maximum [Member] | Restricted Stock Units to be Settled in Cash [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Vesting period for restricted stock units to be settled in cash | 3 years |  |  |  |

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