Recent Accounting Pronouncements - Additional Information (Detail) |
Dec. 31, 2014
USD ($)
|
|---|---|
| New Accounting Pronouncements Or Change In Accounting Principle [Line Items] | |
| Current deferred income tax asset | $ 0 |
| Noncurrent deferred income tax liability | 83,100,000 |
| Previously Recognized | |
| New Accounting Pronouncements Or Change In Accounting Principle [Line Items] | |
| Current deferred income tax asset | 4,600,000 |
| Noncurrent deferred income tax liability | $ 87,700,000 |