Commitments and Contingencies - Employee matters - Additional Information (Detail) |
12 Months Ended |
|---|---|
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Dec. 31, 2015
Employees
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| Commitments and Contingencies Disclosure [Abstract] | |
| Number of full-time employees | 5,830 |
| Number of employees employed under collective bargaining agreements | 1,580 |
| Percentage of employees employed under collective bargaining agreements | 27.00% |