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Goodwill - Additional Information (Detail) (Bachman Group Companies [Member], USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Nov. 04, 2013
Bachman Group Companies [Member] |  |
Business Acquisition [Line Items] |  |
Voting equity interests acquired |  | 100.00%
Purchase price of cash | $ 45.8 |
Issuance of common stock | 319,953 |
Purchase price of common stock | $ 15 |
Date of acquisition | Nov. 04, 2013 |

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