Commitments and Contingencies - Additional Information (Detail) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Nov. 03, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Registration Payment Arrangement [Line Items] | |||
| Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001 |
| American Axle [Member] | |||
| Registration Payment Arrangement [Line Items] | |||
| Business acquisition date of acquisition agreement | Nov. 03, 2016 | ||
| Common stock, par value | 0.01 | ||
| Business acquisition cash consideration per share | $ 13.50 | ||
| Business acquisition common stock conversation ratio | 50.00% |