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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 65,427,000 | $ 188,948,000 | $ 190,515,000 | $ 135,534,000 | $ 273,340,000 | $ 488,777,000
Cash equivalents | $ 4,700,000 |  | $ 107,600,000 |  |  |
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 |  |  |  |  |  |
Allowances for doubtful accounts on current receivable | $ 6,032,000 |  | $ 6,174,000 |  |  |
Current retainage balances | 284,300,000 |  | 307,300,000 |  |  |
Non-current retainage balances | 30,800,000 |  | 19,600,000 |  |  |
Unbilled receivables | 229,100,000 |  | $ 163,100,000 |  |  |
Decrease in fair value of reporting units considered for impairment calculation |  |  | 10.00% |  |  |
Change orders and/or claims | 134,700,000 |  | $ 106,800,000 |  |  |
Total amount of unrecognized tax benefits relating to uncertain tax positions | 52,700,000 |  |  |  |  |
Amount of unrecognized tax benefits change from year end relating to uncertain tax positions | 1,800,000 |  |  |  |  |
Unrecognized tax benefits increase resulting from current period tax positions | 2,200,000 |  |  |  |  |
Unrecognized tax benefits decrease resulting from settlements with taxing authorities | 400,000 |  |  |  |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months upper bound | 10,300,000 |  |  |  |  |
General liability insurance claims deductible | 10,000,000 |  | 10,000,000 |  |  |
Auto liability insurance claims deductible | 10,000,000 |  | 10,000,000 |  |  |
Worker's compensation claims per occurrence | 5,000,000 |  | 5,000,000 |  |  |
Employer's liability claims subject to deductible per occurrence | 1,000,000 |  | 1,000,000 |  |  |
Employee health care benefit plans subject to deductible per claimant | $ 375,000 |  |  |  |  |
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 |  |  |  |  |
Investments in Joint Ventures [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 13,600,000 |  | 19,100,000 |  |  |
Domestic Bank Accounts [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 29,100,000 |  | 127,200,000 |  |  |
Foreign Bank Accounts [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 36,300,000 |  | $ 63,300,000 |  |  |
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% |  |  |  |  |
Percent change in contract estimates impact on operating results is less than this percentage | 5.00% | 5.00% |  |  |  |

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